Longer Nano Duo centering jig

The Longer Nano Duo just came from the Kickstarter, yay!

It's good, but mine was not centered over the base plate.

So I created this model to align to center, and to fixture items in the center at the same time.

Assembly instructions:

1. Screw 4xM2 screw into the straight-track plate
2. Fit the Tension-disc to the straight-track plate with the centering hole to the M2 screw
3. Fit the 4x female Chicago screws from the underside through the open fitting between the straight track and the bezier track of the tension plate
   Fit the tension heads onto the Chicago screws and mate with male-side screw from top.
   This is best done one screw at the time, unless you have 8+ arms and hands ^.^
4. Put the Nano Duo removable base square away
5. Put the Base/Alignment plate into the hole instead
6. Put the tension assembly on top, and twist it so that you can see the M2 screw slits
7. Align the slits so they form 4 Xes
8. Pick everything up and fit the M2 bolts and nuts
9. Put it back in
10. Load a Rectangle ca 70x70mm in LaserBurn at coords x:80 y:70 (center)
11. Project the rectangle preview onto the assembly and square everything with the center bolt touching the corner of the rectangle
12. Tighten the 4xM2 bolts
13. Done

Requires some special screws

• 5xM2 screws and bolts 
  For the alignment
• 4xM2 nuts
• 4xChicago screws for 6mm holes https://s.click.aliexpress.com/e/_oDdoYZj
  Also known as Sex bolt
  For sliding without friction, I recommend very smooth surfaced bolts