Originally Posted by
Genebaby
I just finished my second build last night and didn't have an issue with these screws either time, and I have rebuilt the diffs on the first one too. Strange.
Those couple of screws are quite tight as it's a long thread to tap unless you're using some sort of power tool.
Again a recommendation is a little bit of oil (honestly does not matter what time, shock, diff, full scale car heh) on the screw. It will thread and tap much easier with just a small amount of reduction of friction.