Slop nut z-wobble fix, for solidoodle printers with aluminum bed.

Remixed with the jig to remove the boss nut.

Also, in addition, I highly recommend to take out the z-motor and to straighten the rod using the setup shown in the second picture.

This setup was inspired by:

https://www.youtube.com/watch?v=mRtIxG2co5w

Measure carefully, use a rigid metal base, Find high spots, bend the rod (carefully) in the other direction (by hand), and finally, use a tap and die set and re-cut the thread. This solved most problems for me.