it's been wacky for a while. finally got wacky enough that I found time tonight to get after it.
two year old Kitchen Aid aka Whirlpool. the wash arm was not directing water, just flying about whacking into stuff on the bottom. of course, no water getting to the upper rack.
had earlier discovered that the arm unscrews from the pivot post. but was not able to get it screwed back on.
looked it over seriously for about 10 minutes tonight, and started pulling on the bottom wash arm housing. sure enough, it pivoted and unscrewed from a sixth-turn locking ring on the filter. lifted the housing and pivot up for a good long stare. took the wash arm, and screwed it on tight to the center. the gasket/bearing of nylon looked good. took off the arm, snapped everything back in with a sixth of a turn and a push on the pipe to the upper rack to reseat it in a clip.
can't screw the muffin' arm back on the muffin' axle. can't. can't. held the reference bar on the muffin' axle with a pump pliers, lifted, and tried again. can't.
the system was therefore well-managed in a private meeting with its options presented to it verbally.
excellent interpersonal management skills and firm direction prevailed, and it screwed on tightly.
in the opposite direction of which I had been turning.
turned it by hand, and CLANK. looked around, and part of the hold-down clip for the bottom heater element was sticking up. it had been unscrewing the arm as it turned.
so it should be nicely fixed again. the massive wobble is gone. the CLANK is gone. it's on tight.
no parts bought.
this weekend, I will try the same sterling management skills on the CX7/A. if I don't have OT on Saturday.