[Carlos69]

Originally Posted by Swiss

No design weaknes, if they are built correctly the diffs don't come loose, and to be perfectly honest some of the nicest diffs I have built.
I admit, I had a couple of diffs when built came loose, but that was due to the c clip not seated properley. I discovered this by spinning the diff a couple of times, so didn't have to run the car. Just took the diffs out and double checked the c clip. Even, no need to put the loctite on the grub screw as long as it is very tight. As with all my RC Cars I carry a spare diff, mainly to save having to build one when I am racing.

I disagree, too many loose diffs to say the design is not weak...

If the reliability depends on which side the e-clip is facing then its inherently prone to user error.

Another area of design fault is the rubber o-ring grabbing the screw head.

...(no disrespect but) don't stick your head in the sand about the issue....