FLM Diffs.... rough spot

[nis720]

Can't seem to get these diffs to roll smooth... I've taken them apart several times.

There seems to be a rough spot (as if the cup is not sitting square with gear). I have been trying to break them in with my drill but no luck.

Anyone else had this problem with FLM diffs?



I already had the truck assembled but never got around to breaking in the diffs... figured I would check them again and they were rougher than I originally thought... now I'm getting frustrated cause I still have to deal with the front diff.