I've had the same problem with drum screws. It's easy to drill 'em out and re-tap with a larger screw. Use a hex head or socket head to replace. Some (and I'm one) think it's and ugly feature, but it's a blessing when you load a dry ball or have a difficult charge. Unscrew the drum screw, and add a pinch of powder and a difficult charge will go and a dry ball will pop out and go a few feet down range. Now my cleaning protocol always includes pulling the drum screw, cleaning the drum & screw, applying anti-seize and reassembling. Turns out beauty is in the eye of the beholder, after all.