How many attachments did your mom have? Are there any cams with the machine? Possibly they may be built into the machine. If that's the case, your sewing machine repair person may be able to point them out and help you learn how to change stitch settings without damage. I agree with chance that the H-L may be to raise/lower the feed dogs. I think it's a great machine that will be easy to maintain after the initial servicing and I hope it sews well for you. Have fun Katie!!