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MCamb
Hulsroy
I am thinking about how to do the seat tube replacement on my cargo bike.
My current idea is to make a hole saw Arbor with a solid steel 27mm guide. This should allow me to drill out the seat tube free handed leaving the toptube and seat stay nicely mitered. Current seat tube is OD29mm but I am planning to replace with a 32mm tube that internally is 29.8mm allowing me to use this Zoom seatpost I've been saving.