@pryso, I too had a machine shop do the actual cutting of the subchassis, removing the AR arms bearing well and leaving a hole just the right size for the Mayware. I then took a file and enlarged the hole in the tables top plate, to accommodate the different length of the arm. I little dark brown paint on the exposed aluminum of the plate, and it looked factory! The Mayware was a much better arm than the AR, and corrected the only serious flaw in the XA table.
I had earlier had first a Thorens TD-125 MK.2, which I had nothing but trouble with. It’s electronics were too complicated, and trouble-prone. I replaced it with a TD-150, which was about equal with the AR XA, but had a pretty good arm, much better than that of the XA. About then the Linn showed up, then the Oracle, then the VPI. The era of really good turntables had begun (ignoring the now-resurging Thorens TD-124 and Garrard idler-wheel tables, which I am too young to at the time have known about).