How do I adjust the beater to bowl clearance on my KSM150?

There should be approximately 1/16" clearance between the bowl and beater. If the beater is too close to the bowl, turn the beater height adjusting screw "out"; if it is too far away, turn it "in". The 1/16" clearance can be determined by dropping a dime in the bowl—the flat beater should just "touch" the coin as it rotates.