I spent hours searching the internet, watching videos, and reading technical specs about resetting the needle bearings in my Lefty fork. I was worried I was going to take it apart and ruin it. Truth be told, resetting it is one of the simplest repairs I have ever done. Less than five minutes, super common tools and a little brute force.
Most of the references I dug into, talked about the shock length for different travel forks. If you open it and the measurement is inside a specific range of errors, just reassemble it and let it be. That seems silly to me. If I put my tire pump on and the tire is 10% low, I am going to put the air in it while I am there. That is why I suggest that when you have your fork apart just reset the bearings even if it is only 10%. It takes an extra 30 seconds or less.
Another aspect that I realized it that you just slam the fork down and bottom it out. That is it. Give it a good whack. No need to make this technical. “With the traveling velocity of a common sparrow and end force of applied squares” Blah blah blah. Whack it hard.
Last step, adding air .Start with 3/4 of your weight in pounds. I weigh around 180 so that is 135 pounds. I actually ride at 140 pounds because I like a little stiffer ride. No rocket science of sag percentages, travel ranges, rebound speeds. Start with a good guess (Which is what the charts are anyway) and then adjust it to what makes you ride the best and feel the most comfortable. As long as you don’t add 1 billion psi or have in zero, if it feels good, it is good. It is that easy. Check out the video below and watch me reset mine in around 3 minutes.