Singer 2638 Mechanical Sewing Machine "attach elastic zig zag stitch" Questions

...elastic in a waistband? If so, just your straight stitch or three step zig zag works fine. If you are actually seaming on knit fabrics then you need a stitch with forwards and backwards movement to ...

zig zag. This stitch is great for neatening a raw edge and I use this a lot myself. Especially on wovens as it is always faster to seam with this rather than the overcasting stitch where the feed dogs

...zig zagging the elastic together with regular sewing machine. Now mark the elastic in quarters, ie hold it flat with the join in the middle and mark each edge with chalk or a fabric removable marker. ...

...zig zag stitch or your machine may have a stretch stitch where the fabric is moved forwards and backwards a little to put some stretch into the seam. Also use polyester thread. You need the ballpoint ...

...elastic is available to buy, you might want to use the overlock stitch to attach it to the fabric edge, stretching as you go, then turn it to the inside and use a stretch twin needle and straight ...