You need to take the secondary off the sled and remove the three 12mm nuts and be careful holding down on the helix while you push down on the lower sheave (the moveable sheave). MAKE SURE YOU TAKE NOTE OF WHAT HOLES THE SEC. SPRING IS IN ON THE HELIX AND SHEAVE WHEN YOU TAKE IT APART, and write them down. Numbers add and multiply by 10 to tell you your twist. 6 and 1 is 70 degrees, 3 and 3 is 60, etc. Go up 20 degrees from whatever you have and give it a try. Also check the condition of the black buttons that the helix rides on and the bushings in the helix and sliding sheave.