Kenwood Major A707A, gear slipping. The motor is fine on my Kenwood Major. When the liquidiser is attached it works fine. When the liquidiser cover is on, it looks like the little plastic post doesn't push the gear down far enough so it slips. The mixer end stutters around and stops when it is in food. I dismantled it and cleaned it and can get the gear to work by pushing down on it. Do I need to replace the (metal) gear and/or the plastic wheel? Thanks David

Food Mixers - Kenwood