We have been having "water hammers" for awhile now. For anyone who might not know, this is when water gets trapped in a steam radiator, and it makes sounds that are literally like someone banging a hammer on a metal radiator. Unfortunately the problem radiator is in our bedroom, so water hammers are especially unpleasant there! I read up on it a bit and it can be caused by the pitch of the radiator. It needs to be pitched so that when the steam inside the radiator turns to condensation, it drains back to the boiler. I took apart the radiator cover, and there's a little shim under the bracket that appeared to have shifted. Instead of the little shim, we cut a piece of a 2 x 4 and wedged it under the radiator, lifting the end by about 1/2". No water hammers in the two days since we did this! The problem and possible solution had been marinating in the back of my brain, but I believe watching this reel is what made me put the pieces together and pursue resolution! There are a lot of these videos in the series and they are pretty fun:
https://youtu.be/N0hwoNQEm5s?si=KJWbH23XEzguQv-W