What size Allen / Hex wrench for kc dial set screw?

[Ron Manfredi]

Hello to the group.

I am restoring an SB-400, and need to loosen the  kc  main tuning dial
in order to get the rig closer to freq. calibration.  My short (2")
'L'  shaped  Allen/hex keys are not long enough to reach, so I can't be
sure which one to use.  Can anyone tell me what size I need?  The set
screw looks to be the same size as the ones on the knobs which uses a
5/64" key.  The Heath manual refers to the included keys by a number
size , not a fractional size.  Is  5/64" correct??

Thanks

Ron  WA2EIO

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