Z-Axis anti-wobble system

I design this piece with the intent to substitute the original brass nuts with some better steel classic one and trying to reduce the wobble effetc.
And... it works great!
Also, try this Thing: http://www.thingiverse.com/thing:1638199
Together they give me good results ;)

Hardware needed:
1x M8 nut

The nut fit in really tight, i use a hammer to gently push it in with no problem.

Designed for/tested on a Geeetech ProB
Print it like the photo!