Hi and welcome. I don't think you can get another switch for it, at least not from Sears. They are notorious for not having parts for older routers. I had one of those too and I thought there there was a lockout on the switch that would not allow the router to be energized with that lock on. Are you sure you've unlocked it? If I'm correct about that and you have unlocked it then it sounds like something isn't lining up in the switch to close the circuit again. I vaguely recall taking the router apart once and there is a small screw that holds the lock button in place (it's a little hard to see as I recall) and it has to be removed so that the lock button can be removed so that the top comes off of the router.