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I’m just an amateur, but have become somewhat skilled in adjusting free sprung balances. For example, the Microstella weights on modern Rolexes. I have also had the chance to adjust the Omega Spirate. To me, the advantage of the Spirate is that it is simpler to adjust. The problem with normal adjustment of a free sprung balance is that you have to be quite careful to make sure that weight adjustments are made on both sides of the balance equally, and the exposure of the hairspring places a bit of a risk of damage to the spring, which is not there with the Spirate. In any case, I think it’s more a question of ease of adjustment than precision, because the precision of both is significantly better than the normal variations of wearing a watch from day-to-day with different activities and temperatures.
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