Patent ID: 7199971

Claim:
A rotatable body, comprising: first and second balancing plug holes; a first balancing plug disposed in said first balancing plug hole, wherein said first balancing plug comprises first and second ends separated by a first distance, wherein a center of gravity of said first balancing plug is closer to said first end than said second end, and further is separated from said first end by a second distance, and wherein said first end of said first balancing plug is disposed above said second end of said first balancing plug when said first balancing plug is installed in said first balancing plug hole; and a second balancing plug disposed in said second balancing plug hole, wherein said second balancing plug comprises third and fourth ends separated by a third distance, wherein a center of gravity of said second balancing plug is closer to said third end than said fourth end, and further is separated from said third end by a fourth distance, and wherein said fourth end of said second balancing plug is disposed above said third end of said second balancing plug when said second balancing plug is installed in said second balancing plug hole.