I have a 16-188 setup with a 2 piece walking foot, this going to sound silly but here it goes. I have had this machine for 30 years, she my old friend. But a dozen or so years ago I was in an accident and had a TBI, forgot things that I still don't remember. One of the things I forgot was all of my sewing machines. I started putting together a new craft room. Anyway just a few weeks ago I decided to sit down with my 16-188. I threaded it and needle wouldn't catch the bobbin thread. So I went back to basics, and then it came to me, this machine is not tolerant of being misthreaded. Some of my other machines are much more forgiving. As it turned out not only had I mis- threaded it, I didn't have the thread holder in the correct position. Years ago when I first got this machine, I taped a note on the machine table it says " I like straight lines". When I noticed that I rethreaded my machine and when I got to the needle it was not a straight line, I had the needle in sideways. It threads left to right. But before I even began to figure this out my thought was it's out of time or I need to take it to the machine repair. Each machine has it's own quirks. I have an Embroidery machine and I'm not sure I'm up to the task of that one yet. Now I'm working on my Ruby treadle machine, it's another straight forward machine. My 16-188 is running like a dream now, and I am rediscovering my love of sewing.