20+ years of "Building 904/727 for drag racing use"

The Transgo kit that I am installing in my 727 advises to turn or grind the (looking at your picture) right shoulder down approx 1/2 way. This apperantly alleviates the problem of the servo cocking in the bore. I noticed evidence on the side of the servo bore of some scuffing. Lucky for me, I couldn't feel the scuff so very minor. This according to my Trans-go TF1 instructions.
I don't recall that, but I've only done TF 2's and 3's.. I have the instructions still, I'll have to check it out.,