We understand that your problem is:
i have a kenmore 665 15795792 ultra dishwasher that's about 20yrs old and never really had a problem but lateley it's not draining the water. I did researched on line and tried to take it apart to clean the filter.i got the first part with the screws off but i can't get the screw in the middle off without the rubber part rotating while I try to unscrew it. Can you help???.