I am interested in adding a quick change/piston tool post to my slide rest. For those who are not familar with these, they are a tool post with a some type of doveail slide that takes a cutting tool holder. The holder can be easily moved up and down to very prcisely set teh cutting tip at teh center or other desired height. Turning a handle then locks the cutter in place. With several tool holders, cutter can be quickly changed out each being easily set to angle and using preset height adjustments. Many are available with size codes such as OXA, which I believe is the smallest. A very small tool post not an OXA went on eBay for what I consider a ridiculous amount( >$300), considering that brand new ones go for a lot less. The difference is that the seller promised this would would fit the cross slides of WW type lathes and the lister, a very reputable guy in the Netherlands, showed the foot in the listing. I have seen many OXA labelled on the auction site. I believe that these mount with a "T" bolt. My Sherline "T" bolts are too thick for my Boley slide rest but I don't see any real problem in grinding one to fit if that is all that is needed to make it fit. I suspect the tool holders may be too thick to get a watch size cutter (I use 3mm Carbide and 5mm HSS square cutters) but I have access to a surface grinder and I can easily take a few millimeters off a few holders if that is all that is needed. I do spend a lot of time and effort shimming cutters using the"lantern" tool post. I use 1/2" washers and grind slots to get teh tool roughly right and small shims for fine adjustment. It is time consuming and I have to re-shim if I resharpen the tool. So after all that here are my questions: 1) Has anyone reading this installed one of these? and, if not an OXA, what was it and where did you get it? 2) I have seen some very cheap Chinese ones with an Aluminum tool post; how do these work and is does it work well enough for occasional use? That is even if it has short life can it hold a tool firmly enough t get chatter to acceptable levels? 3) Is the extra cost of a steel post worth while? 3) Micro mark has a small steel tool post which is a differnt shape. Has anyone used one of these and if so how well did it work?