DISCLAIMER: The procedure I describe here may devalue your game to some collectors. It could also be described as overkill. If you know how to adjust, file and repair leaf switches, by all means do that instead. I decided that I wanted to bulletproof my Black Knight for league and tournaments, and that's why I've gone down this path.
For each switch, you will need these items:
Microswitch bracket with 3/16" mounting holes (left- or right-handed):
Williams/Bally Rollover Sub-Microswitch 5647-12693-19:
Williams/Bally #2-56 x 7/16" Microswitch screw:
3/16" clear tubing, or heatshrink tubing