Oh my, the hook on the Singer 115 is filthy. I looked at it tonight and decided that I really should take it apart. But, I have only one Singer 115. What if I really futz it up and cannot get it back together? Oh, right, I paid 5 bucks for the machine (plus 25 for shipping) and it would not be the worst thing I have done. It will never stitch as it is. I took the leap.
I removed the two screws seen here.
I scrubbed the gib (I am calling it that, don't know if it is right. Guess I could look it up on a parts diagram. Be, right back) OK, its called the rotating hook section. Really; part number 55633.