4CS - base bolt
'stk 4CS basebolt F1' indicates we are using:
stk 4CS basebolt and bv pist in F1 [always/only in F1]
gp adj bb in F2
We started this on 4-15-17 with test 2769.
gp adj bb v3 grooved relief hole
primarily used in 4CS half kit, this eliminates the ls circuit