I remember several years ago receiving a Lafleur bow to sell at the same time as a first class Dominique Peccatte. It was clear that on this occasion the Lafleur was by some distance the superior bow, if he was looking down from heaven he would have a small smile on his face maybe!
Lafleur is an extremely gifted maker, he was also an innovator constantly looking to improve his concept of the perfect bow.
He was apprenticed to Francois Lupot, I am certain he probably had the idea of introducing the bottom plate to stringed instrument frogs, only for Lupot to take all the credit. You can see in these photographs that the head has a clavette (fr. pin or peg). This is not because the head is repaired (it is not), he was just experimenting to see how he could strengthen the head.