Have you changed a balance staff yet? Do you have a lathe, gravers, posing tool, truing calipers (assume you have a staking set, balance spring levers, and roller remover)?
Please be aware that there may be differences in the staff that would cause difficulties just swapping one for another, so you might want to find the staff dimensions for both versions and do some comparison before (hopefully) cutting out the old staff on the lathe (please don't tell me you punch them out....please....).
Cheers, Al
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