I don't guarantee this is part you need but will fit engine listed. There probity other places out there this one in link. I see spring there as well.

Here is a link that might be useful: 6hp engine governor

Thanks. I can't wait to look at the part in the morning. There were some metal bits to, so perhaps the picture helps solve that puzzle.

Certified Parts Corporation, in Edgerton, Wisconsin, has bought the old stock from Tecumseh Power, and they also manufacture replacement parts for Tecumseh engines. They have a department for "vintage parts" that might be able to help you.