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Why dont you just make some kind of physical bump stops that protrude from either side of the searpost a few mm so it physically cants lip any lower into the frame, then just use the clamp as normal.
Yeah I think I'm going to go this route but probably just with wraps of additional carbon on the outside of the post rather than any drilling
After spending an hour cutting and drilling a chunk of aluminium last night to make a clamp, I want to make life easier for myself.
Why dont you just make some kind of physical bump stops that protrude from either side of the searpost a few mm so it physically cants lip any lower into the frame, then just use the clamp as normal.
Drill a small hole either side of the post, bond in two small pieces of steel rod, done. The seatpost cross section looks chunky AF, so you might not even have to drill all the way through the post. If you want to adjust the height just sand them flush, paint pen over, and re-do at different height.