On EM machines all switch stacks need is retightening of the two screws. The bakelite tends to shrink over long periods of time. Other than that they are perfect for what they need to do and allow open access to the switch blades for adjusting and cleaning of the points. Microswitches are not the best idea for EMs with the higher voltages and amperage going thru the switches, vs. a SS game, and you can't clean them, adjust them or repair them.

I recently retrofitted an 80s Black Knight (solid state) with worn-out drop target leaf switches to use modern microswitches with plastic bases now used on rollovers on new games, using the existing mounting screws. They do have larger mounting holes than the switch stacks, which let me pivot and adjustment their position quite a bit. It wasn't necessary for me to do the job, but they do have that horizontal leeway.

I saw somebody in here who'd obtained an EM where someone else had gotten halfway thru converting it to Arduino or something like that for the logic to replace the mech board stuff but I think it still used banks of sealed relays to power the playfield coils and score reels, something like that. Anyway it looked like a major disaster to try to finish what had been started, with the mech board now gone and a ton of cut wires hanging all over the place!