[Chequered Flag Racing]

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Karl says

Originally Posted by Karl Dransfield

All you have to do to get a nice diff is make sure that the spur spins freely on the axle by removing the plastic flashing from the hole in the middle. And make sure that the wheel doesn't bind on the axle. That's it.

and LongRat says

Originally Posted by LongRat

The conical washers allow a degree of modulation to be had between loose and fully locked. The more washers you use, the more turns of the nut you will have in the adjustment range.