The cam stack is replaced just as removed. No indexing just drop into place , you might need to rock it back and forth slightly to seat it.
QUOTE=J Miller;5665938]Can somebody answer me a question or direct me to a Singer 500 service manual source other than the Singer site. I can't get on that tonight for some reason.
The cam stack has what appears to be a timing mark on the top. But it was covered with gunk and I didn't see it until I cleaned it off.
It might not be a timing mark at all but I'm getting it back together after a thorough cleaning and this is holding me back.