[R-390] R390A Cosmos disassembly question and a second question too!

[DJED1 at aol.com]

I haven't had a Cosmos apart, but the PTO I disassembled just had the three 
 screws holding the inner cover on.  There was a gasket which may be 
holding  the inner cover closed.  
I have never heard of anyone trying to re pressurize the PTO.  Some do  
bake the unit at low heat to drive any moisture out.  
I assume you have found some of the information on the web about the Cosmos 
 (linearity adjustment vs end point adjustment)?  I did the linearity  
adjustment and it worked fine, but the end point seemed to drift after a year,  
then I would have to readjust.
Ed  W2EMN