[R-390] R391 tuning lock Keys

[g4gjl@btopenworld.com]

I have a problem with some repro tuning lock keys I recently acquired. 

They appear to be too short to reach the threaded innards of the auto tune mechanism, but as I have never seen one of the keys previously, Im guessing (hoping) that this is the problem.

 Would some kind list member with an R391 take one of the keys out and measure its length for me. I need to know the dimension from under the handle, nearest the front panel, to the tip of the key shaftwhich engages with the autotune mechanism. 

Also does any one know the thread size used on the keys? I tried to find a mating nut from the junk box, to help me identify it, but could not get any nuts to fit. Im sure it will be a UNC size, just dont know which one!


Thanks

Pete
G4GJL