[R-390] R-390A KC knob bind

[Larry H]

I mentioned in my last post that the KC knob in the 390A I'm working on had
a bind in it.  I thought I checked the VFO when I first got it, but I guess
not close enough - that's where the bind was at.  And it was not on the
inside, it was the Oldham coupler clamp (which was not tight).  Somehow the
coupling had gotten pushed onto the shaft too far and it was rubbing on the
mounting frame every rotation.  While I had it out, I checked the tube,
components and lubed the inside points.  It works like new, now.  The nut
on the end of the core is just right tight on the shaft, so there is no end
play there or on the shaft bearing.  I have not done measurements on it,
but should be a very good unit.  Now the KC knob turns smoothly and is even
a little easier to turn after the maintenance.

Back to the knobs.  Got to get some more paint - Lowe's was out today.

Regards, Larry