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Take standard 12'' rim, remove center spokes/plate/whatever, attach sprag to plate/whatever/mount setup, mock up wheel to find center while installed, weld sprag and mount to wheel rim.
No need to make a whole new wheel, when all you really need is a rim and you have a perfectly good one on the bike already.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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