Quoted from flynnibus:
He was trying to point out high voltage verse low voltage switch contacts. (But didn't say it...)
High voltage contacts you use flex stones to clean. Low voltage contacts you wipe. Low voltage... the flex stone would strip its coating off and ruin the contact. The tungsten contacts used in high voltage flipper switches in EMs you use a file on.

Flex Stone ruins contacts? Whoops, I've been lightly using them on badly fouled contacts. So on all of your AG and AS relays just paper with alcohol? (Not sandpaper)

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