I've used one since I was 18, and I'll be 31 this year. I've sharpened pen knives with 1" blades of plain carbon steel and "jungle" knives with 10" blades of 3/16" ATS-34. I've used it on several Ontario ka-bars, it was the only way I could get them sharp. On large blades I just set the clamp as far down against the back of the blade as I can, almost against the screw in the clamp. I use a screwdriver on the slotted screw and a multi-tool to tighten the thumb screw so the blade doesn't move. I've never stripped it out, and I'm using my original clamp and screw. I use the oil very lightly on the stones, and I wipe them off and re-oil very often. Then it's not so sloppy.