Products I wholeheartedly endorse

[Urbane Guerrilla]

Lansky's good with bench stones. For most carryin' knives, I can resort to the Folded Paper Trick:
1. new piece of notepaper
2. fold one of its 90-degree corners in half to get a 45 degree angle
3. fold this again in half to get a 22 1/2 degree angle
4. place the folded piece of paper on the stone's face and lay the blade to be sharpened on the fold for a grind angle of 22 1/2 degrees, which is very close to what you usually need for a knife edge. Useful if your Lansky System isn't to hand.

Buck likes to bevel its edges 21 degrees. Cutco likes 20. Straight razors get about 17 degrees or thereabouts. That's where that hole in the very end of the Tri-Angle comes in; you lay the blade flat instead of vertical to use that position. I bought mine thirty years ago. For way less; I'd try shopping around on the Net.