If you ewant to undo the deal, you're entitled, but let me say maybe the real problem is with electronic calipers. What you are talking about is the thickness of this line right here_____________________________________, or one sheet of photo paper. Without cheap electronic calipers, we wouldn't even know it.
Most of the good players I know play with shafts in the 12.5mm range or even less. I wore my Predator down from 12.5 to 11.9 in about 2 years from friction with my hands and contact with chalk on them. Let me just say that I can take electronic calipers and come up with any measurement within a .25 mm range just by squeezing the caliper head.
There are so many more important things about a shaft - the taper is far more important and the squirt - and the cue itself, the balance and so forth, focusing on something like this is just a psychological thing. Maybe to a pro it would actually make a difference, but so would a lot of other things and like everything else, in 15 minutes they would adjust to it and play like god.
Honest, no insult but this stuff gets into our heads. This never would have been an issue if they didn't invent cheap electronic calipers. Now they have digital scales and people are stressing out about gaining 1/2 pound too when a good pee will take care of it -does this make sense?
Chris