If I use build up tape for the lower hand, where on the shaft should I start and how many layers.
When I put extra wraps on the lower hand, I simply grip the shaft with the upper hand and make a mark on the first layer of tape where I want the lower hand tape to start. For me, based on my hand size and how I grip the club in my left hand, it comes to approximately 4.75″ of tape on the lower hand from the bottom or open end of the grip. It will vary from player to player based on how they grip they grip the club. What I described is the way I would do it if I was fitting someone, unless they already had a preferred way of doing it.