? That's why I'm trying to fix them.

I'm hoping that just replacing the pads, which are probably ten tears old, is enough, if I can find compatible ones here.
(Buying stuff from the US is a nightmare, ripped off by currency exchange and postage, if they deign to ship overseas at all.)

I spent an hour sifting through dirt and dust looking for the AWOL magnetic button.
No luck.
Assuming I find it or a substitute, can anyone tell me where it is supposed to go?