The screws used for assembling the ball-bearing + lock washer + multi-purpose bracket are supposed to be 8mm long, but the screws that are packed with the lock washer and 3mm nut are actually the exact same screw that’s packed with the servo mounting hardware. After building four legs[0], I had to dissassemble all of the ball bearing components and slip 2 washers (poached from the servo mounting hardware) between the lock washer and multi-purpose bracket, because without it the servos don’t fit (not even close). I’ve measured all 12 (3 per leg) of the screws and every single one is too long.
We are aware of the issue and trying our best to resolve it. The screw which comes with the bearing kit is about 1.5 threads too long and as such needs to be forced a little into the servo (especially the 485HB). This having been said, it does work, though certainly inconvenient. We have received samples from a number of suppliers only to find they are exactly the same length, or a few threads short (so only half the nut is used, reducing the effectiveness). A metric thread in an imperial length would be ideal. Note that adding a washer may make the joint too large, but we are curious to see your results.
The other approach would be to modify the following:
Rather than having the screw protrude into the servo, reverse how it’s installed and have the head on the inside of the bracket and the nut on the outside.
Thanks for your response! More inline…
Thanks for the details, I really appreciate this transparency; also, that sounds incredibly frustrating.
Absolutely 
For context, I’m assembling the quadruped and I’ve observed that the added strain between the C bracket and the servo makes the whole assembly very tight.
I’m going to assemble a leg with this approach and will do some side-by-side movement comparisons.
The suggested alternative assembly is much nicer—thanks for the advice!