MTXL Center Gauge (center finder)

Inspired from [Woodpeckers MTXL Center Gauge](https://www.youtube.com/watch?v=EzkYJsZYwHw)

See also the smaller version : [MT Center Gauge](http://www.thingiverse.com/thing:1811187)

I designed some gauge bars in metric and imperial sizes, ask if you want some other sizes :
- Imperial : 5/8, 3/4, 1, 1-1/4, 1-1/2 inch
- Metric : 15, 20, 25, 30, 35, 40 mm

You need :

- 2x Bottom.stl
- 2x Top.stl
- 6x Thumb_screw.stl
- Gauge bars that you want !
- 6x [M4x16mm hex bolts](https://www.