Some minor changes to my filament pusher inspired by Tom's update (http://www.thingiverse.com/thing:16928).
I have incorporated a filament guide on the idler (and coined the term guidler).
I also took his modification so the front bearing doesnt rub and I have included a printed spacer so the bottom bearing doesnt rub either (just insert it before the bearing).
I also widened the opening a bit for better access to the hobbing (another of Tom's ideas).
I also included one of Triffid Hunter's suggestions to modify the hinge support piece slightly to make it easier to remove.
Thanks Tom and Triffid for the ideas.