Okay, reworked the tool holder for the M2 Rev.E machines.....since those don't need a Z-Stop adjustment wrench, I opened up the space with a slot for a larger tool. (I'm putting my Cricut spatula in it.)
(It would work fine for the older machines too, if you don't need a wrench peg.)
http://www.thingiverse.com/thing:1516995
Gettin' kind of crowded in there!