Have you disassembled the switch? I have had to do this, from time to time, to do some kind of maintenance to the rack and pinion gears. From removing minute pieces of debris, to cleaning up the teeth in the gears. This has included minute pieces of flash from the mold process and other maladies. They are a bit of an engineering marvel with all the moving parts, etc, but, and to quote Montgomery Scott, a.k.a. Scotty, “the more they overthink the plumbing the easier it is to stop up the drain.”
Steve
