Is it a thumb adjuster?(shown below)(im pretty sure all imagine's came with this type of adjuster, but im not positive) I really didnt understand your post compleatly(but that my just be because im tired haha). If its the thumb adjuster and your talkin about the little screw that holds it in place, you should get a new one because you dont want your velocity to get messed up while playing and your gun doesn't shoot right or worse, someone get hurt, . Any screw that fits in the small hole, and keeps it from turning it will work. As for your feild hasseling you, every feild is differntand i cant speak on behalf of your field.