Kedall, I've never had one of those 15's. As I understand it, the only difference between Singer made 15's and clone machines is which way the needle goes in and which way you thread it. It's either going to be just like the original Singer 15-91 (
link to manual). or the Singer clone machines, which would be the
HA-1 manual, which I posted earlier. Since I've never seen or used one of the reproduction 15's, I'm guessing at this advice. It's a small change from one of the clones and the original 15-91. (Again, I'm guessing it has the potted motor, as I can't see a belt which would be required for most HA-1's.) If neither works, come back and we'll confer and try to find an answer.
bkay