House Doc,
Thanks for your feedback. It is very helpful.
The inside slid right out, so I gave no thought that it was only part of the cartridge.
Also, the vid was very good as well. Now I am just wondering if it is not altogether
better to simply replace the whole unit with a Moen PosiTemp pressure-balancing
valve. Of course, I'd have to open the wall up behind the current valve in order to
access it for a replacement. I'm still mulling that option over.