I did this successfully over this past weekend with an old 1974 Gottlieb Magnotron with anemic flippers and bumpers. I installed 1 bridge rectifier, with fuse and capacitor for each item I converted. This game had 3 bumpers so 3 sets of BR, fuse & Cap.. Did the same with the flippers. 1 set for each flipper.

The fire power of the bumpers were incredible! Same with the flippers. Much stronger plus no more annoying coil buzz. Here is a link to a short video showing the bumpers after the conversion.

Joe