There's a leak at the very top of the garbage disposal, where it
connects to the drain in the sink. How do I repair this leak? Does the
circular stainless steel fitting in the sink pry out? Or is it threaded?
I'm hoping the disposal won't have to be removed and there's a way to
reseal that stainless steel fitting where it meets the sink.
Thanks
Timo

Nope.

You'll have to pull the disposal and reseal it with plumbing putty.

DONT' try to PRY anything.... it's all held together by locking rings
that are easily removed - if you know how to.

It's really not all that difficult, search this group for 'disposal'.
Instructions are here in lots of places on how to remove and replace a
disposal. Or use google, or, since you are going to have to have some
plumbers putty anyway, or pick up a plumbing "how to" book when you go
buy the putty.