Effective March 30, 2015, the yoke collar nut on the Canopy and Track versions of Source Four Mini was changed to a jam nut. The part number for the old nut was HW6747, and the new part number is HW5821. The old part was available in black, white, and silver (HW6747, HW6747-1 and HW6747-5) while the new part is only available in black and white (HW5821 and HW5821-1).
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