Figured I'd post a follow up....I went with CDCO because they had a killer sale on them that ended a week or so ago, and I was able to juggle the finances enough to purchase one. I ended up paying the local machine shop $45 to fit it to my Atlas compound, which mean they shaved down the flat, threaded plate into a t shape, and they also milled a bit off my compound so it would sit flat. I was too busy making money at work to play around with making it work myself, and I had no milling machine anyhow. (That suggestion about facing it off in a lathe with a boss sticking up to fit the t slot was a good one but would have left way too little material in my case.)I haven't actually used it , I picked it up today from the MS.... but I am happy with what I got and look forward to using it. I have a crazy idea to use two sides of it at the same time, one for a cutting tool and the other for a tracer tool, to do some shape duplicating. I don't know it two sides will tighten up at the same time anyhow or if any of the tool holders will fit in there like that...but.. we will see. Great shipping, got here really quickly .