Uploaded May 2026 | Updated September 2026, 2 weeks ago
Nine years ago, a mysterious box arrived from Russia and completely changed the way I sharpen knives.
Yesterday… it happened again.
What showed up on my doorstep may be the most refined, precise, and beautifully machined knife sharpening system I’ve ever handled. The new generation TSPROF K4 takes everything the original Russian sharpener did well—and improves it in every possible way.
Toolless adjustments. Diamond stones. Incredible machining. Precision detents. This thing feels less like a knife sharpener and more like aerospace equipment.
In this video, we unbox it together, compare it to the previous generations, sharpen Mrs. W’s kitchen knife, and take a close look at what may be the gold standard for precision knife sharpening.
If you appreciate craftsmanship, machining, premium tools, EDC gear, or simply beautifully designed equipment… you’re going to enjoy this one.
TSPROF - High precision knife sharpeners - tsprof.com
⏱ TIMESTAMPS
0:00 A box from Russia arrives
1:35 First impressions
3:30 The machining is unbelievable
6:00 New toolless clamp system
7:10 Diamond stones upgrade
10:00 Precision adjustments
15:20 Sharpening Mrs. W’s Cutco knife
19:00 Reprofiling the blade
24:00 Final polish and leather strop
27:15 Cut test
27:45 Final thoughts on the K4
knife sharpening, TSPROF K4, Russian knife sharpener, best knife sharpener, precision knife sharpening system, EDC gear, knife sharpening system, diamond sharpening stones, premium tools, machining craftsmanship, Cutco knife sharpening, guided sharpening system, knife sharpening review
Nine years ago, a mysterious box arrived from Russia and completely changed the way I sharpen knives.
Yesterday… it happened again.
What showed up on my doorstep may be the most refined, precise, and beautifully machined knife sharpening system I’ve ever handled. The new generation TSPROF K4 takes everything the original Russian sharpener did well—and improves it in every possible way.
Toolless adjustments. Diamond stones. Incredible machining. Precision detents. This thing feels less like a knife sharpener and more like aerospace equipment.
In this video, we unbox it together, compare it to the previous generations, sharpen Mrs. W’s kitchen knife, and take a close look at what may be the gold standard for precision knife sharpening.
If you appreciate craftsmanship, machining, premium tools, EDC gear, or simply beautifully designed equipment… you’re going to enjoy this one.
TSPROF - High precision knife sharpeners - tsprof.com
⏱ TIMESTAMPS
0:00 A box from Russia arrives
1:35 First impressions
3:30 The machining is unbelievable
6:00 New toolless clamp system
7:10 Diamond stones upgrade
10:00 Precision adjustments
15:20 Sharpening Mrs. W’s Cutco knife
19:00 Reprofiling the blade
24:00 Final polish and leather strop
27:15 Cut test
27:45 Final thoughts on the K4
knife sharpening, TSPROF K4, Russian knife sharpener, best knife sharpener, precision knife sharpening system, EDC gear, knife sharpening system, diamond sharpening stones, premium tools, machining craftsmanship, Cutco knife sharpening, guided sharpening system, knife sharpening review
