you can open them and try to repair them, but for now i only need sixteen - and those i have. i'll keep the others as spare parts for a potential later repair.
Yes and no, you can open the switch body easily enough, but the actual switch contact is enclosed inside one of the parts inside, you cant get to the bit where metal touches metal at all.
I would also bet that once you have your controllers built you will find some of those buttons just stop working, then when you get them back out they pass the beep test, only to last 15 minutes back in the controller. Am ditching all of mine as they are dreadful dreadful switches, I have some clicky switches of the same design to use thankfully.