Amsterdamman's Stabilized Z axis Herringbone Gear for Reprap Ormerod

*Edit* Both gears slightly changed - Drive Gear: I found a small off-center in the position of the drive gear hole. This corrects that error. The Stabilized Gear: I removed the flare around the inner hex nut hole which makes it slightly tighter on the top giving the bearing a better surface to sit on.

Stabilized Z-axis herringbone gear with nuts on both sides of the gear.
I was unsatisfied with the performance of my Z axis and the lack of centered rotation I saw on the threaded Z axis ro