[R-390] Cosmos PTO, spring-loaded linearizing core?

[Dan Merz]

Tim,  you might want to look at www.davemed.com/cosmos.html  if you haven't.
You can also find this by goggle search "cosmos pto miller 390a".  Miller's
pictures of the innards may be helpful.  Dan. 

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of Tim Shoppa
Sent: Sunday, February 26, 2006 4:53 PM
To: r-390 at mailman.qth.net
Subject: Re: [R-390] Cosmos PTO, spring-loaded linearizing core?

Jim recommended:
> Fix the wife some chicken soup, clean up the kitchen and get the kids 
> under control first.

OK, made that much progress :-).

But now I have more time to write my real question:

How the heck is the linearization screws/plate/core/inductor supposed to
work in real life?

"In principle" it's a spring loaded thing such that the core follows the
40-some linearizing screws through the rotation.

But this is what I find in my Cosmos:

The linearizing inductor has a core in it.
The core is on a leadscrew.
The leadscrew goes through a threaded hole in the metal base of the
  inductor.
On the other side of the leadscrew is a plastic nub that, I presume,
  is supposed to follow the 40-some screws.

What I don't see:

Any way for the nub to move the core in and out of the little linearizing
  inductor.

There's no spring. Nothing slides.

Maybe, just maybe, the nub compresses/flexes the metal base such that the
tiny corrections are made. But it doesn't seem likely.

Maybe, just maybe, the pressurized nitrogen in the PTO provides the
restoring force and the sliding is just the screw wiggling in its threads.
But that doesn't seem likely either.

Obviously my knowledge of how the linearizing is supposed to work has a huge
gap in it, because I don't see how the screws move the nub or how the nub
moves the little core.

Can anyone PLEASE correct my mistaken reasoning here?

Tim.
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