I have a bench grinder that doesn't want to start. I figured out the problem: bad centrifugal switch. It's a two-contact, normally open affair (it starts closed, then as the grinder spins up the weight is taken off and it opens). One of the switching contacts is great. The other looks like the part that was actually making contact got ripped off, or fused to the bottom and then when it sprung back ripped off, or something like that. I verified it's the switch causing the problem because the broken contact arm actually stuck a bit when I closed it, so I pushed it closed until stuck, reassembled the grinder, and it started normally.
This grinder is ancient and the switch would be a complete pain to replace, both mechanically and simply finding a replacement. I'm wondering if I really need both contacts to actually open/close for longevity in the future. Could I just solder the ripped contact arm down to the contacting section? I'm assuming that both have to be closed in order for current to flow, so is it enough to just have the centrifugal part of the switch only open/close that single contact arm?