Gregory,
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I believe this type to be that which I need for the mode switch on the TR4310. Seems it's no longer listed on the EHC website though.
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The data I found on it here:
says, 'Two 4-40 UNC set screws'. I'm guessing that the set screws require a very small, imperial ('freedom unit', in the US - HI!), hex-type wrench. I have one that I reckon is the correct size and that I've used on knobs for Atlas radio, but darned if I can find it right now!
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Regards,
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Mark, G4FPH.
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