[AMSAT-BB] Set Screw for G5500 rotor cable connectors

Does anyone know the size of the setscrew in the NJC-207-PF 7-pin rotor cable connector housing used for the Yaesu G5500? The NJC data sheets & drawings I found do not include this information, and my thread gauges don't go small enough. I'm assuming a metric thread.

Thanks!

73 Steve KS1G