In this post, I'll go over how Singer's hand crank pinking machine works and how to troubleshoot some of the most common problems with it. I love mechanical sewing attachments and accessories. I've mentioned before that I'm a sucker for vintage sewing machines with cams, which are discs that you can use to create various stitch patterns. Vintage sewing machines were able to do so many of the things that modern sewing machines can do, and it's fascinating to see how they were engineered mechanically before computers came along.