eBay Reground Cam

Probably not the cam, friend.
Like said, the DI indicator tip has to move on the same axis as the lifter, and NOT crawl around in the push-rod cup, or be pushed around in or by it.
I fabricated a metal slug, to fit in the lifter bore, with the top and bottom machined flat and parallel to eliminate the cup problem. But that does not prevent the DI tip from scrubbing sideways. So I have to be extremely careful in the set up.

Comp has some interesting tools; Hughes Engines as well, probably Jegs or Summit
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Proform Cam Lobe Checking Fixture and Tools | JEGS