I wind bobbins with an old plastic fantastic from WM. Its not good for much else but why strain my old ladies?
My 15-91 makes a clickity-clickity sound that is louder than the 1941 15 and the 1956 201. I use it mostly for quilting and the occasional denim quilt. Its amazing how well it takes on anything. The metal 15 bobbins from Sew-Classic work best in this and the 15. My wish is to find a way to reduce the sound without affecting anything else.