I should add that initially, I was only able get about 5.6 degrees of caster. I was about to go through the hassle of removing the a-arms and removing material from the caster end of the wish bone when it occurred to me that by taking 125 thou off the lock nut, I could probably achieve the desired result and put off disassembly for a rainy day. The thinner lock nut still does its job and I wound up with the needed adjustment room.
YMMV
