So I have found what might be a temporary solution, not sure how temporary, I will come back and comment in a few days as I have a fair few hours to do on this UM2+. I slid the small gear off the motor axle and saw that there was some grease on the axle so I cleaned everything up, put a blob of super glue on the spindle and then re-fixed the gear. Loaded some filament up and as I did that I held the filament going into the bottom of the feeder and heard the normal feint click. Good news as