Brother LS-1217 Mechanical Sewing Machine "zig zag stitch keeps skipping" Questions

...zig-zag stitch around a letter to make an applique and my sewing machine keeps skipping stitches. I've already changed my needle and that didn't help. What else could be wrong. I doesn't skip when I ...

...zig zag hole of the needle plate -- if too large it will break -- and then thread both needles using two spools of thread and stitch on the right (top) side over the ridge that you can see that is ...

...zig zag stitch, why does the top thread keep breaking? I put the tension in the negative, and set the stitch width and length to several different positions. It starts out fine, but then the top ...

...zig-zag the stitches. Change the needle first and make sure it is inserted correctly. Use good thread i.e.: Guterman or Metler are some. If you are using a stretch material then put a stretch needle ...

...zig zag so you are probably decreasing the length to get a satin stitch. You will get a better satin stitch if you select it directly. I think that it is about 29. The machine forms the satin stitch ...