Here are the rules that govern voids in a ball. Where do they say the void has to be intentional? -- JohnP
Material:
1. The ball shall be constructed of solid material ie: no
liquids, and without voids in its interior.
2. Any materials added to or included in the coverstock
shall be equally distributed throughout the entire
coverstock of the ball, except for materials used in
logos and other required markings.
3. The density of any piece/component in a ball (i.e.: core,
coverstock, weight block, etc.) shall not exceed
3.80 g/mL (i.e.: no pure metals or high density materials).
4. Following approval of the ball, the introduction of
substances that are not comparable to the original
material used in manufacturing of a bowling ball is
prohibited. Likewise, altering a bowling ball in any
way so as to increase its weight or cause it to be off
balance outside the specifications is prohibited.
Plugs and Designs/Logos:
1. Plugs may be inserted for the purpose of redrilling
the ball.
2. Designs may be imbedded in the ball for guides,
observation, or identification purposes, provided such
designs are flush with the outer surface of the ball.
3. Plugs and Designs/Logos:
1. Plugs may be inserted for the purpose of redrilling
the ball.
2. Designs may be imbedded in the ball for guides,
observation, or identification purposes, provided such
designs are flush with the outer surface of the ball.
3. In all cases there shall be no interior voids.
4. Plugs and designs must be made of material similar to,
although not exactly the same as the original material
of which the ball was made, and shall otherwise
comply with all other specifications for a bowling ball.
5. Density not to exceed 1.5 grams per cubic centimeter.4. Plugs and designs must be made of material similar to,
although not exactly the same as the original material
of which the ball was made, and shall otherwise
comply with all other specifications for a bowling ball.
5. Density not to exceed 1.5 grams per cubic centimeter.
