I installed the retro-upgrade of flipper mechs in the lower flippers of my 8BD playfield swap. When it was time to fasten the flipper plate to the field, this seemed to work really well. Surprisingly so. I think I just discovered another "trick" to keep in the tophat. It's not super snug, but it holds the bushing right where it's supposed to be.
Try it, see how you like it.