OK, I bought a set of round butt J frame magnas off of EBAY and they came with a screw that isn't original. I then ordered a short supposedly new grip screw, the shortest available. I got the screw today and it is a tad to long plus it is fully threaded. All my other screws are only partially threaded. Are original screws full thread, partial, or both? I need to figure out if I got.....screwed