Say C and T play each other in an international tournament. T senses the shuttle getting slower and slower when they should be getting faster. 1) T asks for a change gets it and the cycle repeats itself. I suppose T will have to adjust as the shuttle change is permanent. 2) Umpire rejects the change, T breaks the shuttle or crushes it. Is T cheating? 3) If the shuttle keeps slowing is T allowed to call for a shuttle test to settle the issue? Is it provided in the rules? 4) If T keeps complaining then sth must be wrong with T or T is cheating. 5) Something else I missed?