...I drilled a hole through the front of the trigger-guard on my 53 and then drilled and tapped a hole in the folded metal tab in front of the trigger to put an adjustment screw in. The older ones came with the screw in place but the new ones no longer have it--although they still have the metal tab where the hole and screw used to be. ...One thing that amazes me about the 53 is how accurate it is despite the fact that when you break the barrel there is sooo much slop side to side. It locks up very tight though and is a great little pistol.