I came across this post when trying to set the gib hook timing on our Singer 96-10, as our old gib hook broke and part of it flew across the room while we were trying to sew some upholstery. The parts.singerco.com manuals site seemed to be down, but I found the manual on the Internet Archive's Wayback Machine at https://web.archive.org/web/20160501024105/http://parts.singerco.com/IPinstManuals/96-80_100.pdf and thought I'd let folks know of that link that should work pretty much forever. I also downloaded the manual and can share it with you from my google drive if you can't get the link above to work.
