Hamilton Bowen is a top-of-the-line gunsmith and inventor. He wrote a book on it. Look it up as it is worth the read. His products are also top of the line. I have two of his style adjustable rear-sights (Target) on my two X-frame Smith and Wesson's. And he has done the Colt Black-powder chamfer treatment on all my revolvers and other refinement work like measuring the cylinder throats and altering as necessary. And I use his lanyard ring set-up on the Hogue grips of my two X-frames and the lanyard is from them too. I highly recommend Bowen Classic Arms!!!