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Do you think this extruder works with this gear : http://www.ebay.com/itm/For-Reprap-3D-printer-Feedstock-Wheel-Extruder-Gear-Hobbed-Gear-Drive-Gear-/361297222385?pt=LH_DefaultDomain_0&hash=item541efe1af1

I tried with normal MK8 extruder gear and the grub screw doesn't goes all the way in and it bumps into plastic part. Also 22mm spring is not long enough for this gear.