How I do it:
1) With diff out of the car (ie just built), put screwdrivers in both outdrives, and then try to turn the pulley by hand. When it's just impossible to turn, it's probably tight enough.
2) Diff in the car I hold the spur (with slipper done up tight) and one wheel (or a driver in the diff outdrive if you've got the wheel off to adjust it) and turn opposite wheel, should just about move, almost impossible.
3) Set slipper to just slip, so it slips before the diffs when holding two front wheels stationary and turning rear wheels together.
4) Final adjustment check on track, full power acceleration should slip the slipper for 'a few feet', and the diff shouldn't be slipping. Learn the difference in noise between the two!
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