Success

At least it looks like I succeeded in the job I started two days ago. Another trip to the dealer for more oil and a couple of filter gaskets. (One for a spare in case I wrecked another one). This time I carefully installed the new gasket according to the advise I'd been given. I have to say it is one of the more awkward and difficult filters I've changed. Heavy cast iron filter body hanging upside down under the tractor.  One hand holding up the filter and body while the other turns the wrench trying to start the bolt. It was almost a 2 man job but I got it done myself. After a test drive I could not find any leaks. Ready to go to work.