I did indeed have an ADC XLM at about the time I owned the Transcriptors/Vestigial, but I don't remember that there was any special association between the two. The XLM was just thought to be a great cartridge in those days. I once bought about ten XLMs in a local discount house, carried them on a plane trip to England, and sold them at about 40% profit to a dealer in London. (The deal had been arranged beforehand.) Just about the only time I've relished the wonders of buy low /sell high. The Black Widow tonearm comes up now and then on the Agon sale site and/or on eBay. Not as rare as the Vestigial, and probably a lot better sounding than the V.