That's a great idea. I was thinking of making something similar except with a round bar stock and linear bearings but this looks even simpler and better. However, I so rarely have to raise or lower the head mid-operation ever since I converted to TTS collet system and a consistent sized set of tooling that I just haven't felt the need to build anything like that in a while. Although, if it's reasonably priced I'll spring for one just for the flexibility and ease should the need arises.