straight groove portion 110 rotation of the wrist stops when cam roller 104 is in groove portion 110 metal band 94 and closure strip 95 rotate the hand and wrist of the wearer in the opposite direction toward the body midline when elbow 3 moves from the flexed position shown in fig2 to the extended position shown in fig1 this movement is caused by rotation of tube 93 by cam roller 104 as the roller moves from its position in groove portion 110 adjacent end 115 through connecting groove portion 112 and into groove portion 109 adjacent end 114 the rate of wrist rotation and the amount of elbow flexion at which wrist rotation begins and stops can be customized for a specific person when the angle 113 between groove portion 112 and the axis 111 of tube 93 is increased the rate or speed at which the wrist is rotated is also increased decreasing the angle 113 decreases the rate at which the wrist is rotated the amount the elbow needs to be flexed before rotation of the wrist begins is determined by the location of cam roller 104 in groove 109 or groove 110 when the elbow is extended as shown in fig1 the farther the cam roller 104 is from groove portion 112 the more the elbow must flex.