Hello! I have a Jenn-Air Dishwasher, Model DW760B, and the lower, large wash arm won't spin during the wash cycle. Repairman was here two weeks ago for the same problem; he found a piece of broken glass in the assembly, removed it, reassembled everything, and all was fine for the past 10 days. Now, the wash arm is doing the same thing -- no spinning. If you go to Replacement parts for JENN-AIR DW760B | AppliancePartsPros.com, you can see clearly what I think the problem is; specifically Part Number 38. But in order to get to Part Number 38, I must first remove Part 22. Do you have a suggestion about the kind of tool I can use to remove Part 22?