Itβs only a length of off-the-shelf 1-1/8β aluminium tube, nothing rare that Iβm going to wreck.
28.6mm and 25.4mm are common seatpost sizes, so almost 100% a seatpost shim for 28.6mm to 25.4mm exists.
Also quill adapters are beefy enough and made of a grade of aluminium that won't leave you with a trip to the dentist.
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Itβs only a length of off-the-shelf 1-1/8β aluminium tube, nothing rare that Iβm going to wreck.