I've had my mixer for about 15 years and recently I've noticed that the paddle is no longer close enough to the bottom of the work bowl to properly mix the ingredients. I compensate for this by lowering the work bowl and using a spatula to incorporate the mixture at the very bottom of the bowl, then resuming the mixing. I seem to recall this can be fixed by making an adjustment somewhere.
Does anyone know about this? If the adjustment can be made, can/should I do it myself or leave it to the professionals?