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You problem may be simply that the pipe is not hung or supported so it is not hitting something.
Or it may be faulty valves under each sink.
The fluctuation of presure in the water line may bring on the rattle at times.
First, I would try to adjust valves under each sink to a different setting and see if his helps but if it is ill supported pipes you may have to get into the wall or ceiling below to see if hot water pipe is touching anything.
Gerry
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