i use the laser to set up any new rest i buy and go from there. why? because it gets me close, very close. i also set nocking pt and rest height with the bow in a vise and a string level and arrow level. then i dial my sight in at 20 yds. then i back up to 30 and shoot at the same dot with my 20 yard pin. if my groups are a little left the rest needs to go a little right until the arrows fall directly below the dot vertically, or vice versa. then i have my centershot that accounts for the way i torque the bow or the stuff sniper mentioned. that accounts for the first few sets of 'super tuning', which i have found works very well for me.