[R-390] setting the PTO endpoints (long)

[Barry]

> Every PTO I've ever met needed a turn or two removed
> from the endpoint adjusting coil.
> 
> Maybe I'm being overly pessimistic but I thought that simple
> aging of the PTO pretty much guaranteed that any PTO
> would require this turn-sectomy.
> 
> HSN's #45 and #46 addressed the subject quite thoroughly.
> 
> Tim.

Of the two R390As I rebuilt, neither needed this.  Guess I was just lucky.

Barry - N4BUQ