no flat spots should be needed Jim, you only need to do that when going through plastic. I have run CDV's for 2 1/2 years now and NEVER had one come loose on any of the cars, even the Academy, just you got to use a decent driver to nip up the grub screw, make sure all the parts are degrease and use a little threadlock (best get automotive ones, find they are better).
Also, I think my B4 has a ball joint plague... last few times I have run it, seems to break one... one at the F3's, one ball cup today and one ball stud.... Oh... and if you EVER buy used shocks CHECK THE PISTONS.... did wonder why the B4 was hopping about... 3's in the front 2's in the rear.
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