Micrometer

[Murks]

Hi I'm looking for a new staff I used my micrometer can't seem to see any staff that's round that size the measurement a had are: H 1.61mm G 1.77mm F 1.53 B 3.27 A 5.50 this the dimension remamber the staff pivot are broken  does anyone knows where to find this type a staff for a Elgin sixth model 151, 156 that's the tool I'm using a don't actually if I'm doing it correct