I just bought a sxs .410 hammer gun a week ago at a local gunshow. Always wanted one but never see them. It is on a properly scaled action (like the one in this thread) and is a real sweetheart. Not perfect shape but very shootable. 28" barrels and tipping the scales at a whopping 3 pounds 11 OZ. The is it next to my CZ Bobwhite 20 GA for size comparison.
The right hammer screw is a replacement and when I took the locks out to inspect and oil, I decided to take the locks down to do a proper cleaning (they were pretty good anyways) and as soon as I put screw driver to hammer screw on the left lock (with what appeared to be the original hammer screw) the head popped off. Apparently, the screw had been twisted off and the head glued back on for show LOL. Just ordered a 5-40 die so I can make two new screws and engrave them to match the broken one. I might make the heads just a titch smaller so they don't overwhelm the hammers like the ones on it.