Hi all - I’m trying to replace a pot with a broken stem in a piece of equipment but it’s unusual. It’s 500k, about 300 degree with a hard snap-action “on” detent at the beginning of travel, which is all pretty normal so far BUT… every pot I’ve found so far has the normal 3 terminals for resistance PLUS 2 extra terminals on the back for the on/off functionality. This one only has the 3 normal leads which are arranged as expected and that go open circuit when the pot is switched off. I cant for the life of me find the right search terms to find a replacement. The markings on it are custom (pc1313x1) and only point you to the manual and suppliers of the whole board assembly (see attached) who mention that the part is obsolete and out of stock (very helpful…). Any ideas?