Miscellaneous parts. The large flat washers ride in the box side slots. The pipe sleeves are bushings to tighten the fit at the axle locations.
The long axle is the yoke/bottom axle. I drilled and fitted it with grease fittings for lubrication at the yoke hole.
The short axle is for the knee/yoke connection.
The hair pins hold the 2 axles in place, yet allow for later maintenance.
[not shown is the pin for the knee/handle connection.]