I want to disassemble clean and restore my 1921 Beuscher C Melody and replace the needle springs. I dont want to wait until I have it disassembled to measure and order the springs. Can anybody tell me a general reference of the spring sizes? I dont mind if I have a few extra of one or two sizes but dont want to waste a lot of money buying a ton of useless springs either. Also any opinions on whether stainless or blue steel are best would be helpful.