gregs geared extruder with smooth outer for glued GT2 Belt

The small herringbone gear my bowden extruder kept slipping so i thought as i had spare aluminum belt drives i would try to belt drive my extruder, unfortunately i ran into two problems with this, (1) I couldn't get print replacement large gear with a positive enough location on the belt and (2) i would have to order a belt as splicing GT2 belt is not very reliable. then i thought maybe if I glued gt2 belt to the outside of the larger gear it would mesh nicely with the aluminum gear and it did,