And I thought I was the only one with this problem! I keep my boat on a Hydro-Hoist but water collects in the bilge after a hard rain. A couple of years ago, the pump came on after a lot of rain and ran the batteries down. Over that winter I hit the pivot with spray Gunk. The pump still works (It's a Rule). Since that time I take no chances on the hoist while I'm gone. I've got a stick that I slide down between the headers that rests on the flapper valve. I've never forgotten to remove it since I'm always checking stuff back there before I go out. Replacing the switch in my boat would be a nightmare. I always check the pump to make sure it's working before I go out. The pivot hasn't stuck since.