I have made a mount that will slot into the z-mount from previous logs. This mount is intended to hold a dremel-like tool - in this case it is the Tork Craft Rotary Tool.
The latest version STL files can be found here:
I designed this in Autodesk Fusion 360. My first attempt was just to see if the concept would work so I did not print the whole mount. Just the bottom piece where the rotary tool slides into.
Once I did a couple trial runs with that and was happy with it, I added the top piece which stabalises the rotary tool from lateral moments.