[Hallicrafters] SR-150 Set Screws

[Mike Peron]

I'm trying to take off the knobs of my old SR-150 to do a little clean up. I can get an Allen wrench successfully into the larger knobs but having problems with the smaller ones like the RIT and Mic gain knobs. Can't seem to find an US size Allen wrench of the correct size. They are a bit rusty and I'm wondering if a shot of WD-40 would be prudent. Does anyone know the proper size or process for removing these vintage beasts ? The set screw almost looks rectangular. It is hard to see in there even with a flashlight. Would appreciate any guidance you folks can offer. My eyes are not what they used to be

73's
Mike WB6UTW