My Mora auger wobbles quite a bit which sometimes seem to cause the drill to stall. There is a fair amount of 'play' on the shaft of the Clam plate. I guess there is some damage or wear on the bearing or bushing of the Clam. I don't see how to fix this except maybe buying a new bearing and replacing. I don't know if I can, in fact, buy one---none I see listed on their site----and to replace might be quite a challenge. Any suggestions? TIA