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Huh, interesting. I was essentially going to do the same thing without the drill. Don't have a drill but do have a dremel so I'll give it a go tomorrow
frankenbike
fizzy.bleach
Saw a technique for that recently.
Get a wire coat hanger and fully unfurl it. Wind it around a clump of wire wool at one end, then put the other end in a drill. Put the clump of wire wool end in the tube, spin the drill and it'll de-rust your tube.