MakerGear M2 Universal (Left or Right) Spool Holder

I'm in the process of modifying my MakerGear M2 into a twin extruder setup as designed by Tim Edwards. Documented here:
http://opencircuitdesign.com/~tim/3d_printer/twin_project.html

One of the first things I needed was a second spool holder for the right side of the machine. The right spool holder that MakerGear has on GitHub is too large in diameter to fit spools with a 1-1/4" spindle hole such as Hatchbox. It's also too long at about 4-1/2". I found another spool holder that gets the