More adjustable Z-axis Opto Mount

While experimenting with different printing surfaces for my reprap mendel I found that the standard z axis opto bracket didn't offer enough range. I desinged these versions to give me greater flexability without having to alter the flag design.

I designed two versions. The first version, "new-z-mount" is simply a bracket with slotted holes to allow you to slide the opto PCB up and down and adjust the height. This part replaces both the mount an spring with a single bracket. While I found thi