Drill a very small hole in the bottom bracket shell and seal all the places where something goes into the frame (seatpost, bottle braze-ons ect.) with vaseline or grease.
@Lecturer_in_Recent_Runes started
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Drill a very small hole in the bottom bracket shell and seal all the places where something goes into the frame (seatpost, bottle braze-ons ect.) with vaseline or grease.