a la, Gripboard or Grippermania? Were we get a few grippers made of diferent strenghts and mail them to each other in some ordered fashion. Keep the gripper for a week mail it to the next person or to the home location (me ) if there is no one in waiting. Closers get fancy paper certificate and those who close the 2 hardest grippers get a free t-shirt with a logo and OT grip slogan. There would need to be a significant amount of interest though to help pay for the grippers.