Product review (3 stars): Works/fits, but requires special measures to avoid loosening.
Knocked two stars off of rating because of unneeded aggravation.

Background: This nut is a required replacement if you change to a newer inner basket on your Duet - the threaded shaft is shorter on the replacement.

The original basket allowed a taller nut with a proper nylon insert [often referred to as a Nylok]. This nut has a lower/shorter profile, and comes instead with the equivalent of teflon tape in the threads.

In spite of careful tightening, nut had started coming loose, and rear pulley started clunking with a heavy [jeans, towels etc] load during wash.

Learn from my misadventure (I thought the outer tub rear bearing had failed when we started hearing clunking after several months).

Put lots of thread locking compound AND teflon tape on the threads AND use a torgue wrench to get it tightened to 25 ft-lbs.

With special measures, washer has been restored to its quiet original high-speed-spin-demon status.