I'm having a problem with my sump pump and may have to replace it for what seems like the 3rd time in 3 years. The pump comes attached to a plastic base, and it's actually roatating within the base. This is putting the float in funky poisitons and I don't think it's coming on and cutting off correctly. I don't see any way of tightening the pump do the base. Is there any way to do that?