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Pinch-Bolt 1/2 in Wagon Axle Wheel Retaining Collar
A split collar that keeps a wheel on a 1/2 in (12.7 mm) Radio Flyer-style wagon or jogging-stroller axle after the original push-cap or snap clip is lost. It has a 13.0 mm bore and is clamped by one M4 x 16 socket-head bolt with a captive M4 nut, so it doesn't need an axle groove. The collar is 28 mm across and 12 mm tall, and its flat face sits against the wheel hub.
3/4 in EMT Wagon Handle Pivot Clevis
This replaces the cracked folding pivot on a garden or utility wagon handle. One end is a 42 mm deep socket for a new handle made from 3/4 in EMT conduit (23.4 mm OD, bored to 23.7 mm), held by two M5 through-bolts. The other end is a clevis with an 18 mm wide jaw that takes the wagon's tongue tab and pivots on an 8 mm steel pin or M8 bolt (8.3 mm bore). For tabs thinner than 18 mm, pack the gap with M8 washers. The part prints on its side, so the handle pull runs along the layers and not across them. It measures 90 x 36 x 34 mm.