Hi InMoov's fan, This is a derivative of the RobRingV3 design to replace the servos' actuators of the InMoov's hand. Here at the Funlab (http://funlab.fr) we searched for an easier way to fasten and fine-tune the tendons(fishing braid) to the servos. So we successfuly tested a solution using 2 washers with bolt and nut to fasten one tendon, and then we modified the design of the RobRingV3 to implement that solution. With this design it is possible to re-adjust your settings because no glue is used. The actuator's middle hole has been enlarged compared to the original RobRingV3 to fit our servos (MGR996R) Hope you'll like it ! Comments are welcome ! (For french readers,more informations on our wiki : http://funlab.fr/funwiki/doku.php?id=projets:construction_du_robot_inmouv ) For one actuator, there are 4 M3 bolts and 4 nuts : Before puting the cover on top of the forearm, make sure that no bolts are touching the inside of the cover, You might have to screw a little more the bolts (choose short one's), and you also might need to file the inside of the cover at some spots. The last picture shows (in red) the best way to wind the tendons on the bolts. (For french readers,more informations on our wiki : http://funlab.fr/funwiki/doku.php?id=projets:construction_du_robot_inmouv )