Something moving / trapped in my copper hot water pipe?

I hear something moving in my water pipe line (Copper), sounds like a screw or nut dragging back and forth. When I turn on the tap on the sink i hear it move, then when i turn the tap off I hear it again come back. I have confirmed this happening on my hot water pipe line. what ever it is its moving back in forth when pressurized. Any help please.
Should I be worried and have it removed, can I do this myself ?

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