This is my mate Adam King, he has been into traditional crafts all his life having grown up doing craft events with his dad Stuart King. Stuart and I visited Romania together researching traditional craftspeople in 1998. Adam is one of the last besom broom makers, he cuts young birch branches in the winter and dries them thoroughly, bundles them and wraps them really tightly with wire bindings.
Adam may look young but he has long experience and knows how to look after his body. He was telling me that this is the bit of the process that takes the biggest toll on you physically as the shock of the blows travels back up your arm. Note how just at the point of impact he has actually relaxed his grip totally to avoid that shock.
Before it goes too far a quick spin checks the balance is right, it makes no difference to folks buying them to pretend they are Harry Potter or to give the mother in law as a joke but for folk that want to sweep leaves up the balance is important.