Attempt to Pay Back # 2

The nylocks I've seen are 1/4" nut and about 9/64 height, so under your .180 mark. The allens are in these lengths.

1/4"
5/16"
3/8"
1/2"
5/8"
3/4"

So there should be a length that would allow for a decent range of adjustment

Not gunning for doing it while still installed in SB car, be pretty tough. On a BB car that would definitely be a shot.