Thank you, Leon. -- exactly https://cdn.quiltingboard.com/images...es/biggrin.png

Thank you, bkay for the link.

I agree that the thread needs to go over the hook. The instructions are written out and illustrated on page 12 of the pdf manual that bkay linked to. The manual calls it a retaining fork. It does state to hold the spool so that you don't keep pulling thread off and use what you have in hand. You actually go around the disks and into the wire spring. Then pull it up past the retaining fork so that it goes into it and stays in the wire. Then up to the take-up lever.

Janey - Neat people never make the exciting discoveries I do.

Thanks Janey, for the description. I do it so automatically, that it's hard for me to describe. Your description is perfect.
bkay

My MIL had a 15-91 and I hadn't been bitten by the VSMAD (vintage sewing machine acquisition disorder) bug at the time she passed away, and it went to Viet Nam Vets. However, their family friend had a 15-91 and I got that one. Love it. My MIL also had loads of thread- all cotton thread on wooden spools. Some of it is over 50 years old, I am sure. If you pull on it, it breaks. Old all-cotton thread probably is not going to work in your machine. It's a shame, but there it is....

But it looks great on the old spools for a display.

What a great machine! They are sure work horses! Enjoy!

You'll find the user manual Here at Ismacs. Great machines as many have mentioned, many happy times await you https://cdn.quiltingboard.com/images...es/thumbup.png

Threading
 

These may help.

Those are 15-clone instructions and machine. Interestingly enough is that while the majority of the threading is the same, the 15-clones and the 15-91 (and some of the other 15s) thread through the needle oppositely. I think that the 15-30 and some of the other earlier 15s (maybe 15K26) thread through the needle from left to right,wheres the 15-91 threads through the needle from right to left.

Another reason why it is good to have manuals for the machines.

Janey - Neat people never make the exciting discoveries I do.

I’m sorry, I didn’t know that! That’s why I love this forum so much, I learn all the time.