I have no clue what my model number is, but yours looks vaguely familiar!! I'll check when I get home, but I only have the one manual also, I think. I only use mine to serge fleece blankets, so I have no experience with the gathering feature. But maybe my manual gives more info..who knows? I think I have another book the woman I bought it from sent along. It is one she bought somewhere. It did not come with the machine when she bought it, but is by Singer. Oh well, I'll be home in a couple hours and I'll check for you then!
Mary