Unanswered Extruder tab sheared off

All,
I have a Robo3D R1 that I purchased at the end of this last April and it is strictly as delivered (no mods yet). While loading filament, the tab that you use to release the tension wheel so you can feed the filament directly to the hot end simply failed and sheared right off. I can still use the stub to keep pressure on filament for printing purposes, but it does make changing filaments a bear. I have filed a warranty part request with Robo3D, but I was wondering if this was a part I could simply print. I have poked around this forum and on Thingiverse for the standard parts for this extruder, but have had no luck yet. I was wondering if anyone could point me in the right direction if this is a part that can be printed. I have attached picture of the broken part. Thanks!

Chuck

 

May try to use the back piece of this.

http://www.thingiverse.com/thing:519320

if not you could upgrade to this thing.

http://www.thingiverse.com/thing:889541

Or maybe even go bowden?

 

That part is located here: http://www.thingiverse.com/thing:69794