turning off water requires careful "tuning" of the faucet
I replaced the cartridges in the bathtub/shower to deal with leaking and now I have a new problem. Both faucets handles can be turned in complete circles--cutting the flow of the water requires very precise positioning of each faucet handle.
If I take off the faucet handle and simply turn the cartridge, there is a built-in stop/off position (the water supply was off when I did this, so I'm just assuming that the stop position turned off the water flow).
The instructions, which I no longer have, were very simple, so I can't imagine what I screwed up (e.g., no extra parts left over when I was finished).