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A 60-tooth GT2 timing pulley (2 mm pitch, 37.7 mm tooth OD, 41.7 mm flanges) with an 8.3 mm slip-fit bore for 8 mm shaft and a split-clamp hub tightened by a single M3 screw against a captured M3 nut. 22 mm tall with a 7 mm flanged belt land for 6 mm GT2 belt — the big reduction pulley you can't buy off-the-shelf in 8 mm bore.