A glass accidently broke in my dishwasher. I had this happen before and I had to call a plumber because a peice of broker glass had fallen through the filter on the bottom and was interupting the motor. He told me if it happens again, to simply remove the propeller in the bottom, then the filter and vacuum up the broker glass pieces that you can see to prevent them from going near the motor. I have taken out the propeller and the screws to life out the bottom piece, but it won't come out. what do I need to do to remove it? Please help