[R-390] The R-390 gear train issue

[Chris Farley]

Bob, 

1) Mark is the one with the loose shaft, not me.  I was just curious, started digging, and shared my findings with the group...  Obviously a bit prematurely, as evident by the two follow-up posts required for a solid conclusion.  From them you will see that there is indeed a screw hiding back there from the factory, and Loctite was suggested to be sure it doesn't ever loosen up again.  
Also thanks for the Loctite post the other day, it was interesting to read-  I haven't really looked at the different flavors very critically before.  

2) Yes as mentioned in one of the subsequent posts, 82 degrees is the standard for Imperial countersunk screws.  BUT if you look at the specs I found for that screw, max OD of the head is smaller than what is spec'd for a "normal" 8-32 hardware store screw.  This jives with the specs for that double countersunk hole.  A "normal" countersunk screw would stick out and not be flush with the surface, as it needs to be.  You would need to either find the correct oddball screw, or machine/grind/file the head down until it seats flush with the surface.  

Either that or as someone else suggested, chop a hole in the RF deck chassis, which really shouldn't be necessary unless that screw is totally trashed and you absolutely can not find a proper replacement.  

The latter options shouldn't be necessary though.  If that screw was totally missing for some reason (how could it escape!?), the shaft would just come right out along with the gear assembly.  

Regards, 
Chris