https://www.youtube.com/watch?v=8Hf59edbzqY
Here is a video from Wood Mallets in NZ about putting handles on mallets.
https://www.woodmallets.com/
Bob @ East Brisbane was showing me a method he said was really simple with a heat gun. I will chase up what he does and see if we can get a demonstration of it too.
Other methods around? Especially to tidy up old club mallets.