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@Biggles567
wow thats strange, that would really mangle a seatpost. I guess you could get your framebuilder to slot the st/tt thing, then braze a threaded post in there then it would basically just be like a normal frame. But that would damage the paint
I guess the only other thing i can think of is use a smaller seat post, and make a shim that supports it in the seat tube and has some relieved panel that the bolt can put pressure on.