I my Kitchenaid mixer! The whisk and dough beater don't get as far down into the bowl as they used to. For example, the whisk/beater just don't get the bottom section of ingredients like they used to. The problem has gotten worse over the years. I vaguely remember something about an adjustment I could make to lower the thing the beater/whisk/hook secures onto. I can't find my manual. Can anyone tell me how to do this? TIA!