Originally Posted by
johnmark
Thank you everyone for all the great advice, both in the thread and in DMs. I've ordered some books and have hunted down some manuals. I'll also direct her to this thread after Christmas to read all the great info you've given. Thank you so much!
Just a post-christmas FYI: On YouTube right now the channel AndyTube is showing the disassembly, cleaning/repair, and reassembly of a Singer 15-91, a very similar electric motor version of your sister's machine. In fact, Andy's latest video is about the Model 15 tension assembly, which she needs. She can find a replacement tensioner on eBay, look at Andy's video, and install it herself - very easy. Tell her to be very careful cleaning her machine until she does research and gains exoerience - no alcohol-/ammonia-based cleaners - just sewing machine oil (Joann's, Hobby Lobby, or Walmart in my Piedmont NC area). Good luck!
John Thomas in NC