[R-390] R-391 positioning head

[Paul H. Anderson]

Hi,

I've got an R-391 multi-turn positioning head in my hand, and have a
couple of questions.

After soaking it for awhile in kerosene and cleaning the mud wasps nest
out of various parts of it, it seems to behave itself and be in reasonable
condition.

However, the locking pin does not snug all the way up to the big tuning
knob.  Is it normal for some R-391's to do this?

Also, I've noticed that I can get it into a position where the main tuning
knob is locked (this is with the unit out of the radio), and I can see
that the pawls on one of the levers seem to be what is hanging it
up.  With a little careful jiggling and twidling, I can free it up, and
then it appears to resume a reasonable behaviour.  Is this, too, normal,
and just an indication of how the mechanism works?

Thanks for any advice.  I know this is a delicate part, and am being very
careful not to force anything.

Paul