Joined: Jan 2009
Posts: 44,198
Likes: 6,432
From: New York, NY, and High Falls, NY, USA
Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem
Don't use a hammer. Use a breaker bar.
I don't know about a sleeve in this model. But yes, it should be left-threaded, so clockwise is the right way to turn.