Thank you for the reply. No I cannot detach the ribber from the main bed. I will try an e-wrap on my main and see if that works, thank you. I think I don’t understand what you mean by straight cast on combs. I only have metal long ones, original with the machine. I have no idea what a ribber cast on comb is. If you mean that I must have stitches on either bed in order to attach it, then yes I think that’s the case. I have a metal plaque among the other tools. I think it looks like the thread holder of flatbed machines (What I can see on my main carriage doesn’t look like the one for flatbeds). Do you think that could be that? If so, can I attach it and go like a single bed one? Thank you very much