I finally received the Alpha blue I got from the auction site. The machine looks to be in good shape and is very sturdy. The clamps don't slip and the string gripper holds the string steady. I went to calibrate it tonight and I run out of tension screw before I reach the desired tension. I am using an Alpha tension calibrator. Does this mean that I need to replace a spring or something? It gets close, it shows 50lbs on the calibrator when I have the tension head set at 53. The higher I go, the more it is off though. It shows 70 lbs when I am set at 76. Any thoughts? I figure I can string like this, but it seems like I will have to check tension every time.