I'm definitely not going to doubt ANYTHING RonC. stated. This weekends setting started at 9.5 with a uncollapsed spring, new drilled flyweights, 3racing lite weight STEEL clutch bell, new yellow and used clutch spring seat and nut. It bogged out of the corner, L.S.N. setting was checked but there was no gain. Adjusted nut to 9.8mm, now we got something,10mm better, 10.2 set on kill. I had a decision to make at this point because the car started shaking the tires out of a large 180 that leads on to the front straight, back off the nut or go down on the spur. Went down on the spur to a 49 and it was magic. Ran this set-up for 5 practice tanks, 4 qual's and a 20 minute main. From start to finish I noticed no difference and the lap times reflect this. And the little devil that pop's up on your left shoulder would not shut up...