So I got a new pair of calipers. After let's say around 5 tip changes, multiple cleanings and three years of heavy play I decided to measure my shaft. The very tip is 12.75, tip of ferrule is 12.70, where the wood starts is 12.50, about half an inch to an inch below that is 12.39, then it starts to climb back up to 12.50 and up from there goes up ( it is a meucci pro shaft). Is this slight hourglass something cuemakers would tolerate or let out of the shop? Too small of a difference to matter?