MPCNC Z-Nut Lock Remix

I was having issues with the Z-Nut holder actually holding the nut, so I extended the old holder, split it, took a small sliver out of it, and added a line under the nut to keep it from being pushed out of the bottom. It holds the nut pretty tight now and still allows the bottom nut to move freely.

The two extra screw holes don't go all the way through the Middle Joiner, they are just there to help hold the holder together with short screws.