[Milsurplus] R-648/ARR-41 PTO

[Jack Antonio]

Does anyone have any information or knowledge
of adjusting the linearity of the PTO in the
R-648?

Just went through the archives of the R-390
list, and although the -648 is mentioned, there
was little repair information.

Mine is out far enough that the dial zero can't
correct for it, and before I dive into it,
just wondering if anyone has any tips or
information.

Thanks

Jack Antonio WA7DIA/4