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Biggles567
@M_V
I use Dinitrol ML because its a lot cheaper than JP Weigle.
Don’t see any reason for you to avoid bb threads or remove headset cups, it’s just an oil that forms a coating on the inside of the tubes. It can be a bit sticky but wouldn’t think it would gum things up or anything.
You can make a good tool for cleaning corrosion and stuff out the seat tube from a wire like a wire coat hanger and a scotch pad/wire wool/sand paper.
https://m.youtube.com/watch?v=xRIFqasCOSg