According to the Queen's daughter, Princess Anne, during a tour of Australia, the Queen was gifted with a stuffed glove on a wooden lever. The students who invented the contraption were concerned that their sovereign would suffer from waving fatigue. A fair concern, given that she's been doing it for 66+ years.
“They gave her a stuffed glove on a wooden lever so you could tweak the end of the lever and this hand went to and fro," the Princess Royal told Hardman. "I think they thought it was cheeky, but Her Majesty was thrilled.”