Bed Leveling Corner Refit

Originally from http://www.thingiverse.com/thing:1631304 Adjusted the size a bit for my Geeetech I3 Pro C with upgraded 3mm aluminum base plate and 300x200 glass bed. It's a little loose but works fine enough for me. If I weren't lazy I'd set the nut recess back towards the corner by a smidge.
Edit: since folks were actually downloading this I adjusted the piece (version 4) for a tighter fit (for my printer at least.) The nut has been set back closer to the corner and the gap for the bed was snugged up a bit.