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I have a 22.2mm seatpost too, thought I could drill a hole through the 27.2mm at the correct angle, pass the 22.2mm tube through it and weld on front and back
this sounds like a much safer approach
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it was moving left to right a bit even with the binder bolt done up pretty tight
As pretty, and correctly positioned as it is – you've made a bigly long bum lever ... maybe needs a grub screw or weld a nubbin to sit in the binder slot to stop rotation otherwise you're going to have to put forces through the binder that it wasn't designed for.
bigshape
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@dbr
I have a 22.2mm seatpost too, thought I could drill a hole through the 27.2mm at the correct angle, pass the 22.2mm tube through it and weld on front and back, it'd be super strong that way. Bracing to the rack mounts is a good easy solution... it'd look shit though.
Having said all that it seemed to hold up fine yesterday, need to use some carbon paste or something though, it was moving left to right a bit even with the binder bolt done up pretty tight. Guess polished chrome & grease is quite slippy.