the left hand farther back from the center of the drum in order to leave room for the right hand, otherwise the right hand stick often hits the left hand stick. The Hulka Helicopter, by Scott "Hulka" McCoy (also a former marching member and drum sergeant of The Cavaliers), is a variation of the Casey Claw, where both the left and right hands use the Casey Claw technique. External links cavaliers.org - An explanation of the Casey Claw by Scott McCoy. video.google.com - A demonstration of the Casey Claw by Scott McCoy. Percussion performance techniques