Here are a few images of the process of turning a new balance staff for a platform, the platform in question only has a couple of jewels, (7 to be precise) I thought this would mean that the pivots would be reasonably industrial, wrong. They are quite fine, (0.12 mm)
I found both pivots, one in the bottom jewel hole the other oiled to the balance spring. This makes turning the new staff easier because I can see what size they used to be, if you don’t have the bits it makes life harder as you have to guess at the length when you are turning the pivots.
The image above shows the top of the balance with one broken pivot.
This one shows two broken pivots, this is a fairly simple staff shape, no recess at the base of the pivots to stop oil
Using the staking tool to knock out the old staff.
For an idea of size the image above is 6 mm long
