poriomania (pÅrâ³ Ä-Å-mÄnâ² Ä-Ä) [Gr. poreia, walking, + mania, madness]
1 Refers to the bowler's motion that ends with the start of the delivery. 2  arm-swing: The arc of the bowling arm and hand from the swing to the backswing. 3  arrows: Targeting arrows that appear on the lane 12 to 16 feet beyond the foul line. 4  Also called darts.
For the recreational and average bowler, requesting a specific pin placement is unnecessary. Your ball driller should be able to drill any pin placement ball for you to use. If a bowling ball driller says a ball can not be drilled, you should probably find a new ball driller, preferrably one that understands the physics of the new cores.