MPCNC Tool Mount Extra Top Piece

This tool mount is for the MPCNC.

***Additional mount for better rigidity -especially for long cylindrical spindles.***

**Rational:**
I love the MPCNC, but was quite frustrated that the tool mount was relatively short, a significant contributor to slop in the XY directions in my opinion. Perhaps it has been fixed with the latest design (Primo MPCNC) I'm not sure. I keep seeing all these spindles held from the base only - it's not good. The problem is that the tool mount is only 120mm tall. Furthermore, it only has 100mm between mounting points. On top of that, the 100mm is effectively much reduced, because you usually need to mount the spindle at least 25mm higher than the bottom hole to account for collet, shaft and cutting bit. So you end up with *only about 70mm* of effective distance between top and bottom mounting points. (Keep in mind the machine has been designed with 120mm of distance between bearings on the Z axis). This means *we are only getting around 58% of the avai