Position A is closest to the (-) sign and is the stortest drawlength your bow will allow when the peg is in position 3. Now when you rotate the inner module towards the (+) sign, every hole you can line up is another 1/2" . It doesn' t have to be the same hole on the module. When ever you can see a hole line up, count a 1/2" and match the correct peg position. Some are tough, mine is at 28" and I have to drop the screw in under my limb. The recommended peg position gives you 70% let off. Move the peg one less and you' ll be at 65% and move it one more will give you 75%. It says only to move the peg one away from the suggested position. Moving the draw stop peg will also change your draw length a little too. I measured my arrow and drew back my bow, so I would know what the true draw length was. The chart wasn' t exactly correct. Hope this helps.