Just move your fingers down the string until your point on is at 20 yards. Mine is about ¾" gap between the arrow nock and my top finger. Everyone's will be different though.
Blinky, I usually start calibrating a bow by taking a standard crawl, like 1 inch, and blank bale. I figure out where I need to point to put the arrow in the center of the butt. I do not try to calibrate crawls until I am comfortable shooting my standard crawl. There is a lot of feel involved. Once I get the feel, I figure out what distance my standard crawl gives me. I shoot that distance until I am comfortable with a target. Then I start to move up and down distances. All the while, I am focused on the execution of my form. Stringwalking will punish you for form breaks.Thanks guys, that is what I was looking for. I will try 3/4 in. between the bottom of the nock and my top finger.
Depends on the length of your arrow and your anchor point. I tune my hunting bows for a 5/8" crawl at 18yards. So that is to say you can tune your gap within reason and limb performance.
Gary,Just shoot a 5/8" gap and forget string walking no tuning problems
That ain't working that's the way you do it,LOL, I'm not good precise enough to count strands and I use stringwalking primarily for hunting so I don't feel the need for tournament precision. I found that a 20 yard crawl corresponded exactly with the gap between my top two fingers when placed on my normal "touching the nock" hold. Perfect, I don't even have to look. Every 5 yards further from there was approximately 1/4" up out to my 40 yard point on...