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I think you are right. I found some pics of other movements and the spring looks straight from the double bend. I think the arched bit is being pushed down by the bridge which is then applying too much pressure.
It's not great engineering design when the performance of the movement depends on how one small spring is bent, Omega or not !
The movement 5M43 is obsolete, but most parts are still available, so it depends on what is wrong with it as to your best option.
Repair the existing movement, or find a donor movement from a second hand watch, Jon says we need to what is wrong before we can give advice.
I am not liking the arch in that spring. It seems to me that the double bend at the base near the screw hole is what is supposed to be supplying the tension.If it were my money, I would flatten that spring a bit , making it effectively longer. it would overshoot the cog and not catch.i would do my bending at the base.