As a reminder for the next time in this rodeo, the latches holding the temperature adjustment knob on the Delta 17 Series dual-handle bath / shower faucet look like this:

I am unable to apply enough force to the smooth edge of the knob opposite the handle to un-latch it, so I jammed a small prydriver into the gap and twisted enough to pop the latch, at the obvious risk of scarring the chrome plating.
A better approach would involve a plastic prydriver intended for consumer electronics case cracking.
For the record:
- Unlike the other bath faucets, this one has shutoff valves inside the wall
- The replacement cartridge is RP46463
- A dab of silicone grease on the rotating valve surface in the back improves its performance
Ideally, I won’t need any of that information again.
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