
Article written by Nemo Sandman – Edited the 5th of November 2025.
All rights (pictures and text) reserved.
Have you ever wondered why so many Spyderco Sprint Runs seem to appear out of nowhere, featuring gorgeous carbon fiber handles and impressive CPM S90V blades?
It’s simple — Sal Glesser loves both materials.
For him, carbon fiber reflects his lifelong passion for motorsports, while S90V stands out as a stainless steel in a league of its own, combining high performance and outstanding reliability.
So, long story short:
Full Flat Grind + Carbon Fiber + S90V = Sal Glesser’s favorite combo!

And to quote my friend Spydercollector:
“When the Bushcraft fixed blade was first announced, Sal also planned to do a so-called NASA version; a version of the Bushcraft knife with all high-tech materials. I believe NASA is a protected name, but Endeavour still evokes the high-tech approach most people associate with the famous space agency. The Endeavour features a full flat grind S90V blade and full sculpted carbon fiber handles. It was a beautiful knife with a grip that had me looking around for stuff to cut.”
https://spydercollector.wordpress.com/tag/chris-claycomb-endeavour-prototype/




Here is the Proficient: it is designed by wilderness expert Chris Claycomb of Bushcraft UK, the Proficient functions perfectly with traditional bushcraft skills and cutting methods. Carefully contoured and polished to eliminate hot spots and ensure maximum comfort during prolonged use.
https://www.spyderco.com/catalog/details/FB36CF/Proficient-trade-/943

Bushcraft knives are defined by specific parameters — typically featuring blades between 4 and 6 inches. Spyderco’s Bushcraft model fits perfectly within that tradition: a 4-inch, full-tang blade with no handguard, purpose-built for control and versatility.
In true Bushcraft spirit, users generally favor high-carbon tool steels over stainless options, prioritizing edge retention and cutting performance rather than corrosion resistance. The O-1 tool steel used here, with its high carbon content, delivers excellent long-term sharpness while remaining easy to resharpen in the field.
Carried on the belt or strap in a leather sheath, this knife is blueprinted for wilderness chores — slicing, chopping, whittling, and processing game — all in the traditional Bushcraft style.
To quote Spyderco:
“The Spyderco Proficient takes the concept of the traditional “do-all” bushcraft knife and elevates it to new levels of performance with state-of-the-art materials and manufacturing methods. Designed by wilderness expert Chris Claycomb of Bushcraft UK, the Proficient functions perfectly with traditional bushcraft skills and cutting methods while offering superior durability, edge retention, cutting performance, and corrosion resistance
Instead of traditional carbon steel and an axe-like “Scandi” (Scandinavian) grind, the Proficient’s blade is crafted from vanadium-rich CPM®S90V particle-metallurgy stainless steel and boasts a full-flat grind for low-friction cutting performance.“

This concept of a stainless blade paired with a black polished handle has, ten years later, been fully embraced — a perfect example being the Casström No.10 Swedish Forest Knife in Black Micarta with a 14C28N flat grind.
I first discovered CPM S90V back when it was still known as CPM 420V, thanks to Darrel Ralph (RIP) and his beautiful Apogee folder. The blade was astonishingly wear-resistant — so much so that, without diamond abrasives, only a backstand could bring it from dull to sharp. It was a bear to sharpen then… and still is today.
The difference is, as end-line users, we now have easy access to industrial diamond tools, making steels like S90V finally practical to maintain at their full potential.

I have written a lot about S90V. This alloy has proven it can be tough enough as a stainless steel to be used in any all terrain tools; especially since it is available on Manly folders which got the reputation of using a very fine thin geometry on their blades.
Modern Bushcrafters (like the Benchmade Puukko) are focused on toughness with the use of the very tough CPM 3V.
What does CPM S90V bring to the table?
It’s incredibly wear-resistant.
This steel is notoriously hard to dull, even when cutting abrasive materials like brown cardboard loaded with silica. It keeps its edge far longer than most steels, making it ideal for demanding, real-world use.
Also the full flat grind is a must in a matter separator specialized in wood works. As much as I love Scandi Grind found on Woodlore clones (first designed by Ray Mears).
I have found that especially in the wonderful Spyderco Sprig full flat ground knives can be really efficient on hard wood.
(BTW when the writing appears in green: it is a link !! and I have tested them here.)
It’s stainless!
Even if you (like me) enjoy the patina that forms on a great carbon steel blade, there’s real peace of mind in using a reliable stainless steel — especially when working near water, in the rain, or by the sea.

The Sprig was an impressive tool in terms of pure geometry. Designed as a hunting and fishing knife, it was a real wood eater — a beaver of a blade, cutting deep and effortlessly.
Guess what? The Proficient shares the same profile, especially after a bit of convexing — which I’ll be covering soon in a second article.
So far, that contoured handle is an absolute delight to use, and I’ll be putting it to the test in the upcoming piece. While the old O1 Bushcrafter had enough heft for light chopping, the Proficient excels at powerful push cuts — a completely different experience.
Interestingly, the Proficient isn’t a big knife. Once sheathed, it can disappear into the front pocket of a pair of denim jeans — no need to let it dangle from a belt.
So what do we got ? Imagine the plateforme of the Bushcrafter (link) a solid companion, a reliable 4×4 and you just turn it into some Urus from Lamborghini: stellar alloy and lighter tougher handle.
The Proficient is Sal Glesser’s gambit — a bold move in a world where the bushcraft community traditionally favors carbon steel and natural wooden handles. This knife dares to break from that norm.
Of course, this jewel comes at a price, and most bushcrafters aren’t Wall Street sharks. They use Opinel, Mora, or at best a €100 fixed blade — unless they’re ready to splurge on an original Woodlore.
So, the “stealth wealth” of this NASA-grade bushcrafter isn’t for everyone.
It’s like a Lamborghini — not the most practical, but a statement of refined performance and engineering excellence.
Because in the end, real performance comes at a price.
Article written by Nemo Sandman – Edited on November 5th, 2025.
All rights (pictures and text) reserved.




















That handle is made in some kinf of thermorun… but it is rubberized Santoprene is a soft, non-hygroscopic elastomer which exhibits excellent surface appearance, a durable soft-touch feel, excellent colorability and excellent “processability”… made by Exxon.


























































It has all started when I wanted to review the Spyderco Gayle Bradley Junction. It’s a great design for an EDC fixed blade which can be used for everything. Easy to carry in its pancake constructed bolteron sheath. But the edge was just too thick for my own use.
To my knowledge, SPF27 is some kind of CPM D2 steel. A lot of carbon 1.5% and not a lot of chromium around 12%. Not the easiest on the stone as a semi stainless. It was not very soft under the diamonds compared to another blade in N690 HRC59 I got with me. And it was not really easy to remove the shoulder to create a gentle convex edge. Patience… In sharpening is important. And I often lack of it but I was able to improve it.
Next some black stone mostly to remove the scratches.
And then the white ceramic to get a better finish and a razor steel.
You can notice the chamfered signature hole on the Junction. A première. The cuts were deeper. It was better! Much more enjoyable.
But the spine was too sharp for my thumb and diamonds came handy to rounded the angles. It would never be a Sebenza spine….
Again the control during whittling was much much better. One should never be scared to round the edges for suiting your own needs.
The handle is very flat on that knife. It’s an attention for people who wish to stash their knife in a pocket or a backpack without leaving a print.
But a flat knife is not the most comfortable in the palm of your hand… Especially when cutting hard things for a long time.
I decided to make a quick comparison with the Spyderco Sprig which is a pleasure to use.
You can notice how the Phil Wilson’s Sprig got a thicker handle. And it change everything when cutting hard things. Also Phil Wilson’s is all about performances. Its geometry is stellar.
It immediately cuts deep in wood without any real improvement needed….
But diamonds were there to be usef. 🙂
I was able to get thin regular cuts into the wood. So I have decided to try the diamonds on the Gayle Bradley Bowie I have brought with me. This one got a thicker geometry and is made if the same pulverized alloy as the Junction
You can always improve an edge.
Used as a light chopper it worked just fine.
Gayle Bradley has provided a great compact Bowie which can be used as a light camp knife.
You can see: it’s not a lot bigger compared to my Ed Chempp Bowie.
And the edge once thinned is honorable.
Of course it is not as thin as my Pekka Tuominen Urban II for example. And not as aggressive as the Sprig…
I got…. too much knives on my table…
An Francesca knows how to prepare the pasta with pomodori.
Crostini a la Toscane. Poultry liver, oignons, red wine, bread and a Bowie.
Back in the outside I was thinking of a simple way to see the “impact” of good geometry on whittling. On the right, a single cut if the thin Delica and, on the left, a single cut of the thicker
Also the Delica was able to cut from the ricasso to the point without any hard pressure. In the end, I had noticed that the Junction was less good than the Sprig and the Delica was still the best whittler in the batch. No matter the steel, for wood cutting, geometry is queen. So I have taken my Bowie back to the diamonds and put a keener edge. Tomorrow it will be hunting day.