Hello! I have a Huskylock 936 (serger) which I like pretty well EXCEPT that the knife “comes loose” at very inconvenient times. What I mean by this is that it can be serging along beautifully and all of a sudden it starts chewing. At this point it either doesn’t cut at all or else it partially cuts and frays the fabric. In either case it rolls what should have been discarded the stitching. Needless to say it isn’t pretty! or flat! Though the knife wiggles just slightly it is enough to ruin the serging process big time. I take it in to my dealer, but it doesn’t stay put for many hours of serging. The last time it happened was while I was serging the edges of an armhole to the sleeve cap before I sewed the side seam together. The fabric was cotton. It was going along fine until I came to the yoke section and a third layer of fabric was added. I ended up trimming the the seam to 1/4″ and serging without using the knife. (Now it will cut and serge a single layer of fabric only.)
Is there an adjustment I can do myself? I haven’t found one and I’d like to know if there is a way to do it myself so I don’t have to drag my machine into town every so often. It is discouraging to be in the middle of a project and have to quit.