The broken balance staff was not riveted on, or least it wasn't secure. I noticed it was loose while taking the roller parts off. The staff just pulled off, so I suppose that saves some time.
There's a two-piece double roller and the main part was very tight. I was afraid it would crack! I polish the staff body quite a bit (nice shine) and then went very slowly. It went on fine.
Sweep seconds...
New staff, now running well...
Elgin number 41758229 is a grade 581, 21 jewel 16 size, made about 1942. Military B.W. Raymond model with sweep seconds...




















