I shut off the main water supply in the evening to replace the shower cartridge. I came back the next afternoon to finish the job. When I turned on the water main I started getting continuous water hammer. I shut things back down again.
I went and opened 2 of 3 sinks, the tub, and the outside hose all the way, but I still get this symptom.
I have valves to control the supply side (before the water meter) and after. The supply side is fully open, and I've been opening and closing the side after the meter.
What should I be doing so I don't ruin my plumbing just trying to fix a dripping tub spout?