Okay, now I "get it" - it is for the spool pin that is located closest to the hand wheel and not in the middle of the arm. It is like the White 11 that we have. Yet again on the other thread you said "And then they replaced the spool holder and base backwards so the oiling holes don't line up with the body of the machine!" Isn't that the same thing as part number 796? I'm guessing that the arm of that part is broken off. The 11 is tucked away and hard to get to, so I can't take a picture of it.
I also get how you figured "My feet screw on from right to left." Actually, to change the feet, you rotate the knurled nut, as indicated by the red arrow, counter clockwise and slide the foot out toward the front of the machine. If you click on the thumbnail, it will open the picture to a larger size. You will have to click the "back arrow" to get back. Or, you can right click and open in a new tab/window, so that you can close the picture without losing the tab/window with this thread.
So, no, the Singer low shank feet will not work on your machine.
Janey - Neat people never make the exciting discoveries I do.