[R-390] correct size bristol wrench for BFO clamp behind the faceplate

[Bob Young]

Does any one know what the correct size for the bolt on this clamp is? I 
bought a set with these sizes:  .060, .072, .096, .111, .133, .145, .168, & 
.183, and 4 flute wrenches in .069, & .076. and 4 are too small and six too 
big, the  bolt is smaller than most other in the radio inlcuding the knobs 
and larger clamps, thanks, I think it's somewhere between .076 and .096.

Bob young
Millbury, Ma