I pulled this thread up in a Google search trying to also find out if my Sears Kenmore Model 158.17741 is a "Super High Shank" machine. I thought I'd come back and post this very helpful website that shows you how to measure your machine. I can confirm that my model is a Low Shank machine. If you scroll down below the measuring diagram, the website alphabetically lists all sewing machine manufacturers with all their model numbers for their shank size...
http://www.nancysnotions.com/text/co...otlisting.html
I joined this Board as well, since I plan make my first quilt very soon. Also, I've been trying to cheaply find a new (just the shank portion) of a new foot for my machine. There is a tiny piece of very thin medal on the bottom of the shank that holds the feet attachments on the shank piece and it is held on the shank with a very fine tiny little screw. That's the piece I need. If anyone can help me find a new piece, please let me know. That tiny little piece of metal on my shank bottom (the little piece of dark metal with the little screw) has snapped off on my shank -- so I can't snap the feet onto it anymore. Thanks, if anyone can point me in the right direction to find a replacement low shank... or just the little piece of black metal that has snapped off on my shank. I could just unscrew the broken piece and replace with a new piece if there is a way to find just that part?