Originally Posted by Asharus

the right rear shock screw backs out when the arm gets old as it wears out the hole. replace the arm and the problem will be fixed. you can always put a reverse threaded screw there to prevent it from backing out. let me know if you find a reverse thread screw of that size, im interested as well.

in 8th scale the reverse threaded screw is a must on the front right and rear left shock bottoms, else it will back out after each run. i guess its the same deal with the rear right screw on the b4 since it is front facing just like the front right arm.