THIS PHOTO SHOWS SHAFT SLEEVES BEING REAMED TO AN EXACT FIT. IF THE SLEEVES ARE NOT REAMED, THE SLEEVES MAY NOT BE AT AN EXACT 90 DEGREES TO THE CENTER OF THE SHAFT.
THIS IS A PHOTO OF ANOTHER SEEMINGLY UNIMPORTANT TASK. WHAT WE ARE DOING IS LAPPING SLEEVES ON A GRANITE LAPPING PLATE WITH 1000 GRIT PAPER. UNLESS EVERY COMPONENT IN THE CUE IS LAPPED AT AN EXACT 90 DEGREES TO THE PERPENDICULAR CENTERLINE, THE CUE WILL NOT ROLL STRAIGHT. ALSO, GLUE LINES WILL BE APPARENT. THERE ARE NO GLUE LINES VISIBLE IN A DENALI CUE.