Originally Posted by BoJangles

Billy I don't know what a 15-90/91 is? I am looking at my Model 15 Manual and it lists a 15-31, 15-33, 15-35, and 15-36.
It seems all these machines had different feed dogs. The 15-31 had a drop feed, the 15-33 had a wheel feed, the 15-35 had a drop feed, and the 15-36 had a wheel feed and a trimming attachment.

I not sure which Model 15 I have or what a 15-90/91 is? My Model 15 is my 'newest' treadle as it is a 1939 model.

I am trying to figure out how to drop the feed dogs and it looks like you have to loosen a lock nut. This looks scary to me because the manual then talks about how 'to time the feeding mechanism" so that the feed dog or feed wheel finishes its feeding movement when the thread take-up lever is at its highest point.

Billy does dropping the feed dogs mean I will have to re-time them to get them working right again?

Nancy