Hi Im John I will help you with the d/w problem.
Is this the spray arm in your d/w ?
Yes, that is the one. However, I want only this question answered and do not wish to sign up for anything else.
This spray arm is threaded into a part under the tub/liner of the dishwasher. A rubber coupler on top of the motor and pump assembly is what this spray arm assembly screws/threads into. To change/remove this spray arm, simply push a flat screwdriver through the hole in the bottom of the spray arm and twist it off. It should be a regular thread.
This is the part number and the cost.
Sears has them in stock.