It's a long shot I but saw a question asked here years ago of someone looking for a manual for Capitol 300 sewing machine. If anyone has a manual and they would be willing to share it(PDF pictures,scan/email whatever!) I would be most eager to hear from you!
Arwen

Maybe this will work.
Capitol 600 Instruction Manual (http://www.sewusa.com/Sewing_Machine_Manuals/Other_Manuals/Capitol_600_Instruction_Manual.htm)