i would call bell and carlson and ask them.might be a common problem. they might have screws or recommend a spacer or maybe a remington part number that you could order a new screw. you could go to the local hardware store and just find a nut and screw down on it then cut off or grind a couple threads off the screw. when you back the nut off it should smooth out the rough spots so you can use your original screw.