I have a t wrench too, which was given to me by a frustrated Cummins tech (5. 9 and 8. 3's) its still in the corner of the tool box, maybe it really for the M-11, n14 etc. . anyhow I do like the. .
I use the Snap on tool with the knob and attach a 1/2 drive 9/16" socket. Its a two handed job rather than three handed with this nifty tool.
Its less than $65 from Snap on V22a is the part no.
Once the adjuster nut is snugged it usually doesn't move ehn its torqued. Reck to assure this after torqing (valve spec. ).
Good luck
Andy