Quick Tension Knobs for Deltaprintr

#### What is this?
This is an easy, toolless spectra line tensioning system for the Deltaprintr. It replaces the plywood pulley mounts at the top of each tower. With this design, just home the carriages, pluck the lines, and give each knob a quick twist so they're nice and tight. No more tools, no more feats of strength required, no more worrying about lines loosening.

I've been using this design for a couple of years, and I'm pleased as punch. I started a [thread](http://forums.deltaprintr.