They had a 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 he 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. Great shipping, got here really quickly .