I need to buy a bobbin cover for the Singer 99. I bought a Singer 99 at a tag sale. It looks like it was never used, but it is missing the bobbin cover. I found them on Ebay, but some come with the spring, and some don't. I see the the bar in the machine, but am thinking of how to attach it. Is there something that is supposed to be attached to the cover? Also the cover is missing one of the latches. Is it fixable?