Spray Arm - Middle

Based on troubleshooting guidance from this site, ordered 3 parts: middle and top spray arms, and a chopper. Removed upper rack and flipped it over to get to the middle spray arm. Removed a single screw to remove the spray arm an replace. Noticed a small hole in the manifold that supplies water to the middle spray arm. (Will need replacing soon.) That was the easy part. We have very hard municiple water that has left a lot of mineral deposits, even with regular use of cleaning tablets. So, the upper sprayer also needed to be replaced: it was not spinning freely. This required removing the feed tube for the top sprayer enough to pop the sprayer off. (There is a video describing how to do this.) Because the chopper was also being replaced the whole sprayer feed tube needed to be removed. Between the videos and the part diagrams I was able to get down to the chopper protector, but removing the screw did not "free up" the protector. The minerals from the hard water nearly "welded" it in place. Was finally able to carefully pry it up from the screw tab with a paint can opener. The chopper had come apart and the chopper's screen was almost completely clogged with gunk. Replaced the chopper and reassembled. Also, all through the whole repair process I did a lot of scraping and soaking with white vinegar to get a lot of the mineral deposits off areas exposed during the repair, though not neArly all deposit. The site was a great help. Thanks to all who contributed.