Elgin Grade 82

This watch is a George M. Wheeler model, grade 82, 18 size. It was made in 13 and 15 jewel versions, this on, made about 1884, has 15.  

Here's the setup getting ready to separate the old staff, with a broken pivot, from the balance wheel.  This is done by cutting away the hub of the staff (the lower part) in the lathe down to almost, but not quite, nothing. Then the remains of the hub are popped off in the staking set.

This is the new staff riveted in place, and what's left of the old staff including the little washer that is all that's left of the hub.