checking valve to piston clearance with hyd lifters?

I took 2 old lifters apart and shimmed them to make them solild lifters. Cut a bolt to length so the cup/piston wouldnt move, leaving it right at the height that i could still get the snap ring in to hold the cup in in place. I have seen the same done with washers stacked up too.

Good idea. Solid lifters I don't have. Making one never ocurred to me! I'll use a few of the old lifters to fabricobble some solid ones. Thank you!