My drve shaft for my weed wacker broke off at the end going into the male female coupler where the attachments fit into. I orderd my new drive shaft but cannot get the broken piece of the old drive shaft out of the male female coupler.ON the parts sheets I do not see the coupler any where. Am I forced to buy the whole upper shaft assembly now just to obtain the coupler and if so is the upper drive shaft assembly complete with drive shaft and coupler at end of shaft?The coupler I am talking about goes on end of drive shaft assembly and has square hex slot where the drive shaft of the attachments fit into.Please help