"Roy Lewallen" wrote

cam switches in the 465 and some other scopes use PC board pads for
contacts, and when the pad's gold plating is gone, the switch -- and the
scope -- is dead.

It is possible to re-plate the gold. But imagining the circuit board
it may be impossible to mask the components. Aw, what the heck - gold
plate the whole thing and screw it to your Hinkley yacht.

--
Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer: Electronics; Informatics; Photonics.
Remove spaces etc. to reply: n o lindan at net com dot com
psst.. want to buy an f-stop timer? nolindan.com/da/fstop/