Adjustable Z-axis NEMA 17 mount bracket for 20x60 extrusion

I recently bought a 3D printer kit from Creative Machines in the UK (http://creativemachines.co.uk/store/index.php?id_product=44&controller=product). It uses 20x60 t-slot extrusion for the frame and have been testing out different things. One thing I found was that I needed some adjustment in the mount for the Z motor so that I could line it up better and reduce some z-wobble I was getting.

I made this in 3 parts to use the best attributes of the machine. I needed it square, so printing the r