Quartering the Wheels

Following,  is the method I used for Quartering the wheels. Although the axles are keyed at 90 degrees, there is still some axial play between the wheel and the axle. With this in mind, a jig must be used to assure the crank pins are at 90 degrees to each other. The wheels are set in place with a close fit and Loctite.
The crank pin of each wheel fits into a hole in the end plates of the jig.
The axle is held in place by an adjustable center, screwed in from each end.
Without split axle boxes, they must be slipped on the axle before the second wheel is positioned!
The crank pin holes in the end plates are exactly 90 degrees from each other. 
Here you can see the center pushing into the end of the axle.