I received this machine from a friend who said it could be used for tennis. However, it's too small for tennis rackets, and I don't play badminton, so I'm selling this machine. The tension adjustment screw works, and the grippers seem to be functioning, but I have no experience stringing badminton rackets. When I received it, one of the shoulder screws for the frame gripper was missing, so I installed a replacement screw. The frame gripper can now be adjusted normally. I will also include a spare knob, so please take it with you. Everything shown in the photos is included, including the badminton string clamps. Please feel free to ask if you have any questions. This product is used, so there is significant wear and tear. Please refrain from purchasing if you are concerned about this.