Modified Morgan z-bracket for 8mm openbuilds screw

Here is a modification for the Quentin Harley's Reprap Morgan z-bracket.
This mod give the possibility to use the OpenBuilds 8mm lead screw with the special nut :
http://openbuildspartstore.com/8mm-acme-nut-block/
http://openbuildspartstore.com/8mm-metric-lead-screw-acme/
A 300mm long screw is just fine on the Morgan.