A stitch regulator controls the length and width of the stitches.
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Many sewing machines have the cross stitch programmed into them, which you can vary to a degree
Two. One from the main spool on top, and the other from the bobbin on the inside of the machine.
Yes, you still need a sewing machine, as the overlock machine is designed simply to finish the edges of the fabric. Overlock machines do not go backwards, turn, zigzag, or anything stitch functions that you may need (depending on what you are sewing) You do not absolutely need a sewing machine if it's a quick and easy project (such as a repair, or a pillow), but for everyday use, you need both.
Yes, do a search for Singer Sewing Machine Manuals. There is probably a fee to receive a copy.
Depending on your elastic's thickness and how much fabric you are guiding into the elastic, I would use a standard needle (12) with a stretch stitch on my machine. Kate