Kossel Mini heated bed holder

I used quite some time Boo's Adjustable heated bed holders but I noticed that my aluminum print surface is rotating and therefore causing some problems with print quality.
Easiest fix was to tape aluminum plate to the holders but that was kind of uncomfortable to use.

So I modified the existing design and made it to hold the heated plate in place.
Afterwards I added some electric tape to the place where holder and heated plate are connecting to improve it's grip.

E1: Rounded out some corners to make printing easier.

For fixing I used regular M4 15mm bolts and knobs by funbart (http://www.thingiverse.com/thing:641854).

E2: Check out my new improved heated bed holder / leveling system: http://www.thingiverse.com/thing:2124667