[R-390] RE: R-390/URR

[Bob Young]

I have found the problem as far as the backlash (play actually) in my 390 
but it is very hard to explain. I took the counter drive gear apart which is 
part of the Kilocycle change control locking disc which is shown in figure 
#40 in TM 11-5820-357-35 and is right behind the panel. One side being the 
split gear and the other being the larger disc which is facing forwards. The 
problem is there is a little round piece of metal riveted to the outer gear 
of the split gear, this goes through the other gear and goes into the middle 
of two pieces of metal which are held together by a spring on their opposite 
side and are on the shaft. This little round piece of metal is loose where 
it is riveted to the first split gear and is the cause of the play in the 
control, it is worn and I doubt it can be fixed, it is supposed to be firm, 
the spring is supposed to absorb the play I think. Does anyone happen to 
have one of these for sale?

Bob
KB1OKL