I have a TAPCO barrel extension that I want to install (silver solder). Question is, when you screw on the compensator, when it is at it's tightest, one of the notch lines up with the pin and it is held in place. When I screw on the extension tightly, then screw on the compensator, it is not lined up. Presumably people have sanded down the part of the extension that screws on to the threads on the barrel until the compensator lines up? Any thoughts?