I just had to throw away my Singer Sew and Stretch fro 1970 which was a wedding present from my grandmother. I purchased a used Singer Stylist 6544 without a book. The repair man said to go on line to find. I need to know how to do the bobbin and all of the different stitch controls? Please help me. I was going to look at the 6550 and didn't know if it was similar and could help me. Thank you Jill