It's a Z floating head idea. Works well. Recommend cleaning the inside of your holes well with Q tips, and polishing the 1/4-20 bolts with car wax and you won't need oil as it slides perfectly. Hope this helps

How to convert your OX CNC to a plasma cutter at low cost

Step by step designing and implementing of my plasma approach

I wanted a dust shoe that have a easy access to tool change and something that kind of float on the surface. And I have seen shoes with long brush that sucked in by the vacuum. I think I have the solution too all that here.