oil drain plug gaskets available ????
My washers were thoroughly used up, and leaked. I looked all over, including some serious specialty industrial gasket / seal places, and could not find anyone with copper sealing washers in anywhere close to the correct size. I talked with an application engineer at one of the seal vendors, and he confirmed that the copper seals are pretty much unavailable theses days, they stopped selling them just a couple of years ago. The newer fiber gaskets are just as good and a lot cheaper, his advice was to buy a roll of gasket material from the autoparts store and cut them out myself. Did that, and no leaks so far.
If you've got a source for the correct copper seals, I would be interested.
If they aren't too beat up, you can anneal the copper with a propane torch. Heat it to cherry red (a little hard to see in the copper), and then let it cool slowly. Sand out the ridges on a piece of wet sandpaper on top of a really flat surface (plate glass, granite, solid counter top, ...) in a circular motion. (wear gloves so you don't sand down your fingertips as well
) And then anneal the washer again. This process worked well for some copper sealing washers for the injectors for an old diesel tractor I've got.