I never sand the plates but i do rotate them after a rebuild and replace them after both side have been used. I use AE diff silicone oil (clear) and put it in the diff gear and fit the balls, And on both sides of the plates before putting it all together.
I tighten the diff screw until the T-nut / spring is fully compressed then back it off 1/8th of a turn. checking in hand to make sure its not notchy, If it is i back it off another 1/8th..........
I then put it in the car and with the slipper set as instruction manual i hold the Spur and one wheel (front or rear) the spin the other wheel (front or rear) the slipper should slip before the diff. If so i then set the slipper by testing it on the surface and setting to personal preference dependant on conditions.
Mike
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