Quote:
Originally Posted by Tools
If there is a drop of oil on the hairspring, or it sticks to itself for some reason, your watch would run fast as you described.
A smack could shake the oil off, or affect whatever is sticking the coils together.
In the days before non-magnetic hairsprings, they could get magnetized and stick to themselves. Now days most magnetization is to other parts and not the hairspring. Magnetized parts do react with other ferrous parts.
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Amazing how durable yet delicate these movements are. I was also under the impression that the hairspring could not be magnetized, so your theory might be accurate.
Who knows, but at this time since it is running as it did before I am not going to push my luck and be happy my little italian tune up trick worked!