[tekuhn]

NOS switch arrived yesterday. Ohmmeter check showed some contacts not consistently making a clean 0Ω connection. I practiced disassembling my old switch first to make sure I could do it without damage. I cleaned and reassembled the old switch and it performs pretty well. I can still wiggle the lock cylinder a little and make the connections somewhat intermittent, but I think it's good enough as a spare for backup.

I disassembled the new switch - it was indeed NOS with no wear on the inner contacts. The original contact grease had hardened to the point where it prevented solid contact. I cleaned the old grease off and applied a good silicone contact grease. Reassembled, and the switch is perfect.