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Oh no! Bad news. Thank you for letting me know. Do you know if, when that happens, it creates disaster (i.e. water spraying out)?

Also, any use spraying on some penetrating oil or something on it...

:) Alas johnjh2o1 is quite right, i should have attached a photo of the entire set-up. Here it is:
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Based on LLigetfa's suggestion, i found this:...

Hi,
First time posting in the forum - hope i get it right. I'm a plumbing novice and am not sure what the additional knob below my shower handle stem is. I've been trying to find out via the...