True variable width spool Holder

This is an adjustable width spool holder.
It is meant to mount on the bottom of a solid plate.

http://youtu.be/8fSdvyERoJE

I'm sure if the inner parts are needed for stability.

Most spools should fit, I changed the design a little bit I hope the taulman spools fit now, but no promises.

Some additional parts needed:
4x LM8UU linear guides
2x 8 mm steel routs
4x DIN 7991 Screws M8x25
4x DIN 934 M8 nuts
8x washer 8,4x30 mm
4x bearing 8x22x7mm (DIN 625)
2x DIN 934 M4 n