well I decided to calibrate some grippers today. I calibrated the 3.5 that I closed out of the package. This one http://www.gripboard.com/index.php?act=mod...si&img=5149. To my suprise it was calibrated at 195lbs (3.78). The RB300 of doom was 187.5 (3.65). custom RB365 250 (4.75s) RB300 stealth 195 (3.78). So I decided to try the "Super Galaxy" 2 3/4 spread . so I started with 225lbs on the loading pin and went from there, with 225lbs it moved about a 1/4. I had my dad help me stack weights