My Kenmore softener was consistently running. After looking, I noticed the white tab on the microswitch had broken off. I ordered a new one, installed, and the white tab broke off right away. I was able to epoxy the outer shell back so the switch is fine, but before I reinstall it, I wanted to know what would keep causing the switch to break? It is a Kenmore 625. 348670. The switch does not have the metal arm, just the white button., It does look very tight tolerances when the hub rotates, any ideas?