Sorry dude got busy for a minute, a knock-out hub is used for a cycle-truck front wheel. Earlier models have axle "holes" at the end of the fork rather than "slots". The stand mounts to the axle as well, with stand and wheel in place the axle is pushed through and bolted. Or, in the case of dis-assembly, un-bolted and "knocked out".They are larger in diameter than most standard hubs and accept the larger ga. spokes(105 ga.) Oh, BTW nice score! Lots of E-pay material for sure! LMK if you happen to find one, needdle in a haystack I'm sure, but thought perhaps a little luck might come my way! Later & PEACE!!! :mrgreen: