This is my dirty personal procedure to oil and lubricate capstans from tape decks. Capstan lubrication doesn't usually fail in decks, but when it does, it produces nasty speed variations that sometimes are not properly traced to this origin.

AS for what type of oil

"Dear readers. And Nacho. Sewing machine oil is very fine for a lot of works around decks, but not for capstan. For example, with it, you can ruin almost immediately a Revox super precision bearing and only replacing it will works. Since few people look after service manual recommendations, please don't use it as a routine. For worn bearings it could help a little, before considering replace, but for any other case, use fine and fully synthetic oil made for capstans. It costs 20 euro and lasts for a life. For sinthering purposes, the best way is cooking-no cold lubrication can diffuse deep enough."

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