A lot of us who restore and make knives and razors make our own pins for said items. There are a couple hints for making them work better. 1. Make sure the striking face on your hammer is highly polished. It makes the brass (or silver, or whatever you're using) spread smoother and more evenly. 2. Don't stick too much pin out of the washer. I sorta eyball it, but probably not more than 1/64 of an inch should be sticking out past the area you're trying to mushroom the brass head to. Having too much sticking out virtually guarantees bad results, as the head will only mushroom so much without splitting (looks bad) and increases the chance you'll bend the pivot pin (is bad):angry021 3. Don't hit too hard. Hundreds of little taps gets you much better results than a few heavy ones.