[R-390] R-390A RF gear train clamp lock washers

[Chris]

While cleaning off the bench for a different project, I took a closer look at my crusty EAC RF deck.  What I saw surprised me!  

From the earlier thread regarding gear clamps and associated hardware, the split lock washers and their use/misplacement was brought up.  At some point during or after the Stewart Warner drawings were made, a split lock washer was added to each clamp screw.  On my '62 contract Amelco unit, these washers were under the square nut which seems to be the norm.  This would seem to be the wrong location, as the nut cannot turn more than a few degrees by design of the clamp.  Conventional logic would say that washer should be placed under the screw head to prevent it from turning, rather than beneath the square nut.  

On this EAC RF deck, I discovered the split washers are indeed placed under the screw head instead of the nut!  Not only that, but there is a dob of green thread locker on every nut!  It's probably impossible to tell where or when this changed, but it seems they are out there in all three configurations-  No washer, washer under nut, and washer under screw.  

This RF deck is order number 23137-PC-60 with a sn of 1159, if that tells anybody something.  

Just though this to be rather interesting, and wonder if anyone else has noticed this same arrangement on any other decks.

Regards, 
Chris kc9ieq

Sent from my outdated iPhone wireless thingy