[R-390] Cosmos PTO and compensator stack ...

[Mike Castellana]

Had an interesting (and fun) afternoon today...

The Cosmos PTO on my R-390A was binding slightly.
Symptoms were sqeaks coming from inside PTO and more
effort needed to adjust KC knob.

This was the first time I've attempted this procedure.
I read everything I could find on PTO's including Jim
Miller's excellent overview. (Thank you sir)

I tore PTO down to it's two seperate halves. I made
notes as to number of threads visible on main shaft
before further disassembly. I tightened and lubricated
where needed. With PTO back in, binding and noise is
gone and it's easier than ever to twist KC dial...

This brings me to my question. When I had the PTO in
two halves I stupidly <REMOVED> compensator stack
without taking note of it's exact orientation on the
shaft. This stack has 48 adjustment screws and 12
empty holes (no screws) 

Before I tackle adjusting PTO's linearity, how do I
know compensator stack is installed properly?

I followed Mr Millers suggestion of locating 15th set
screw (from clockwise "end" on stack) in adjustment
window. Radio is running fine tho' readout accuracy is
maybe 2kc +/- MORE off than I'm accustomed to.

Please pardon my long-winded-ness and the fact that
I'm not so clear here, I'm really on the curve!

Thanks in advance for any help.

Best,
Mike

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