Quick tip: planing stop for thin stuff

I was trying to find a decent way to hold <1/4" thick material while I planed off saw marks, and this is the solution I came up with.

I sharpened the head of a counter-sunk screw, (meaning I ground the top surface down until it intersected the sides at a sharp angle) and drilled a countersunk hole in the bench top, enough that it will be well below the surface when not in use. The sharpened edge bites in just enough, and holds the other end down well, even if there's the slightest bow in the stock. Thin stuff is notoriously unstable, and the ability to hold the other end down is the solution I've been looking for.