You could probably figure out the size pretty easy if you have a screw from say an duplex electrical receptacle or light switch that was used to fasten the receptacle or switch to the box. I still can't remember if it was 4-40 or 6-32 but I doubt it was metric as I never really had to mess with any metric stuff back in the late 70's or early 80's. I had that 220 open a while back and noticed I'd soldered a nut in the old funnel shaped nut's place directly on the PCB! They were aluminum and somehow I'd cross threaded mine and ended up ripping it off of the board. I once buggered up one those old funnel shaped threaded antenna sockets they used on a lot of the newer Electra programmable models like those from the old BC-220 era. And they were perfect as one was VHF-LO and the other had both VHF boards installed in it from the factory. They had very cheap buy it now prices as well which I don't recall anymore but they were cheap. I'd found the old unopened BC-III's on an eBay auction a long time ago. Yes, I still use a pair of BC-III's today for our VHF Low Band state patrol's backup system and another for some of the local VHF High railroad frequencies.
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