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Here is a video of my PDB (You can skip to 13:40). I uploaded the CAD files and parts list with a source for the air cylinder to Grabcad a couple of years ago. The PDB is still working perfectly. I...

I built a PDB and used the one below. It looks exactly like the Tormach one.
I'm not sure if it is the one they use but it works great.
I did a video a while back and I included a link to GrabCAD...