I use modeling clay. Lightly spray your piston top, and the bottom of the valve with wd-40 or use a very light oil. This prevents sticking and staining.
I've heard people use "play-do" as well, but I've never tried it.
I've seen people use solder, but it only shows you the dimension in a tiny spot, and I like to see my dimensions across the valve face.
As far as a newer, tricker way, there probably is, but clearance is clearance, Clarence!
|