Originally Posted by mad dog1
for me there was never any confusion. i owned the gamma 6004 which is a lockout w/ the metal diabolo that spins on a bearing and also had the wise with the fixed plastic/nylon diabolo that is fixed that i used on the gamma 6004. both diabolos functioned identically.
I thought that we established that the spinning diablo on a lock out machine serves to keep the string aligned with the gripper & not so much help, if any, with the gripper crushing force. A diablo on a machine like Babolat Star 4 serves the same purpose as on the lock out with the additional benefit of reducing the crushing force of the gripper. The method by which a lock out machine senses tension does not allow for the diablo to take any of the work away from the tension head. Therefore it does not change the tension seen by the gripper.