I got two of these from eBay for $4, but paid many times more on shipping. The pin is cemented right into the pinhole, and looks like a mini version of the Lee pins used with multiparts. The top of the pin is threaded for the mounting bolt. Lou Hall got one of them, and then promptly broke the insulator away to reveal the inner workings of the pin. It was not threaded on the top, just grooved and cemented.