Originally Posted by
ArchaicArcane
Some 15s thread right to left and some left to right. The easiest way to check which way it threads is to look at the last guide before the needle. Does it pull the thread to the left or the right? If to the left, it threads left to right. If to the right, it threads right to left. Alternatively, you can also look at the needlebar. The flat of the needle will always set against the flat side of the needlebar.
Tammi, there's a simpler way even than that.
Two rules for threading a model 15:
1. If it has reverse it threads
right to left, if it doesn't have reverse it threads
left to right.
2. The flat is always on the side the thread exits the needle.
In fact these rules apply to all of my Singers with one exception: Rule 1 doesn't with the swing needles (306/319/320) because they thread front to back. I think slant shank machines are like that too.