Conley's text is so far out of the ball park, it pains me to read it...Of course that gun was made in Buffalo c1923 and up to 1930, and well after his 1908-09 falling out with Ithaca...the patent for that gun is 1450496...the reason for that pierced head screw on the trigger, is so you could adjust the LOP by 3/4 - 1" in either direction...this feature was recently introduced by Beretta (I think)