I've owned many McDermotts and I just got a new McDermott butt over the weekend. When I roll it by itself it rolls perfectly straight but when I put any of the shafts on it it has a nice little bow when rolling it. The i3 doesn't bow much and an older maple shaft doesn't show much light at all but the g core has a really nice bow. Upon further inspection all my other cues the first thread is almost down in the butt and this one is above the butt. Is this an easy fix for a cue repairman and how much does it normally cost?