VEX motor to Tetrix metal adapter

I'm using this adapter to implement VEX 393 2-Wire motors on an Arduino-powered robot, called (wait for it) ... the O-bot! I've mentioned this robot in one of my previous designs, and I plan to upload pictures of all of the 3D printed parts on the O-bot and the bot itself once it is completed.

UPDATED: The original design had one major flaw: the area where the screws attached the motor to the mount itself was insufficiently connected to the base, resulting in the motor tearing itself off of the mount under high torque. PLEASE USE THE UPDATED FILE (VexMountMk4)