[R-390] Kilocycle Change Knob Collar

[ToddRoberts2001@aol.com]

In a message dated 1/24/2004 9:17:58 AM Eastern Standard Time, 
BENZONR@ntsb.gov writes:
Gentlemen:

The kilocycle change internal knob retention collar with the set screw on my 
early Motorola R-390A has broken.  This makes it impossible to tune the radio, 
obviously.  Does anyone know of a quick fix for this?  I thought of using or 
modifying a drill bit stop collar or something similar.  Barring that, are the 
knob retention collars available out there somewhere?  Hate to have to obtain 
an entire knob assembly, but would like to find one as a final alternative.  
Thanks, in advance, for the help.

                                                    Bob Benzon
                                                    Fredericksburg, VA        
                                                Bob, a close match for a 
replacement knob retention collar for the large KC/MC knobs for the R-390A is 
available from Stock Drive Products online. Catalog number S3701Y-C112. It is 
known as a Split-Hub Gear Clamp, I.D. 0.438", thickness 0.250", set-screw size 
#6-32. Single price $8.34. You can see their product line at  www.sdp-si.com  .  
I think someone has been selling R-390A knob clamps on the e-place from time 
to time also. A small size hose clamp might work in a pinch but I would go with 
the proper style split-hub clamp. 73 Todd Roberts WD4NGG.