Wondering if anyone else with a Gamma Progression ii ELS has had any recurrent problems with the tension button? The tension button works intermittently and this happened for the first time about 10 months ago. I installed a new button from Gamma then and now after about 300 racquets the same thing is happening again. I press and nothing happens( most common ) or I press and it pulls and releases.Turning the machine on/off doesn't help. It may operate normally for 10 pulls and then acts up. Kind of frustrating as it's adding about 5 minutes to my stringing time. I've contacted Gamma's customer service and they are very nice, but I haven't been able to reach their technical supervisor. I'm having a hard time believing that the buttons are only good for about 300-400 racquets.