Plastic support tab on one side broke, so ordered new part after researching on-line. Had never taken rack out before, and tab on the other side broke when taken it out. Instructions for replacing adjuster assume that you know how to take the rack out. Replacement was easy when I knew what to do. Screwdrivers were needed to guide parts back together or to help pry pieces apart, not for screwing or unscrewing anything. Reinstallation was relatively simple, but required care not to break a support tab in the process.
Recommendation - Replace both of the adjusters at the same time. If the plastic is brittle for one, it will be brittle for the other as well.