Cam degreeing help me understand!

There are some people that use a solid lifter and a pushrod with a dial indicator on a magnetic base, but it won't be as accurate as a single solid piece like RRR said. I honestly about said that yesterday about the hydraulic lift, but I thought you had a solid lifter to check piston to valve clearance.
No im planing on making one tho. Im gonna try a few things this morning before bed I will let you know how it goes lol