While on my search to find the most reliable machine to use a WISE tension head at the lowest cost I have noticed something about the WISE machine in that it doesn't appear to be made for 360 degree rotation. While observing various types of machines I noticed that most machines have their linear gripper at an angle where the string does not enter the gripper parallel to the ground. I took a survey of various brands and you can see both "high-end" and "low-end" stringers have their tension head slightly angled up . Below are the various stringers I looked at... https://image.ibb.co/nfL2MJ/stringersurvey.jpg Then, saw a video of a CP string machine that has a similar tension head of the WISE where the tension head isn't angled and noticed the mounting system appears to bend/move when tension is pulled, which cannot be good for maintaining tension (skip to 2:27). This leads me to believe that it is made for the string to enter the WISE tension head horizontally from the grommet and not at any kind of angle. Possibly the string machine in the video is just of poor quality and that's why the mounting system moves on tension? Is the diabolo made to fix this issue of the string coming in at an angle? If so, then why have the diabolo on the non-WISE tension heads if they are already angled?