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Welcome Rob,
Yes, they can be very tight. But you may be encountering a problem you don't need (at least for now), because hairsprings and balances are matched at the factory based on weight, so it is not standard practice to mix and match in a service setting. You may very well find that the timing range is not acceptable once you did do the swap.
If a pivot is damaged, one should replace the staff, or the complete balance. The 61 series balance wheels have very thin arms that deform easily, I'd recommend replacing the balance complete if you aren't adept at staffing yet.
 
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