Back to the OP Topic: buying reman'd or rebuilding your own.

Excluding the gifted tinkerer who can take a few cans and smelt them, a few bottle tops, and presto - bingo you have a pop tester, if you end up doing them yourself, you will inevitably spend a lot more on rebuilding them yourself versus the reman'd. The reman'd are running around $250 for a set of 5 shipped to you or even less. I have seen them at $28 a pop. However, they are not German made and having such a part made in either India or China does not excite me. Of course, I am excluding from the above the gifted tinkerers who can make their own pop tester for under $10 ... and the endless stories of folks who made their own pop tester in a few hours in their garage from a bunch of junk they picked up here and there ...