I've recently acquired my great-grandfather's Remington Model 10 (serial #272XXX) from my father's estate. I've been busy bringing the old girl back to life but I don't have a lot of details about the scatter gun because my grandfather and father have passed away without leaving any information about any of their firearms. In any case, the original butt plate is missing. In its place was a make-shift rubber pad, covered in a old leather butt pad, covered in miles of electrical tape. When I removed that mess my grandfather had fashioned over time, is when I discovered the butt plate was missing. I ordered a "new" replacement but when it arrived and I placed it against the butt stock there is a gap. I'm looking for options on how to fill the gap between the butt stock and the "new" butt plate while making it functional and look good at the same time. Photos attached may not show well due to the size but I'm looking for smithing ideas to make it work without making any adjustments to the butt stock itself. Black rubber, perhaps? But, if so, where would I get it? Any other ideas?