Make sure there are no greasy residues before you use it. Before you use it, put some in a small container and let it evaporate. The most likely easy available solvent is lighter fuel, provided it is clean. Whatever you do, don't use acetone! It's great for removing paint, nail varnish etc but far too strong a solvent for most purposes. Should I swab it off or rather use a blower to blow it dry? Are there any tricks of the trade that help here? I think the impulse jewel is friction-fit and the collet is squeezed to hold the hairspring, the hairspring is pinned to the stud, so there should not be any reason not to use any kind of solvent likely to work. In the meantime I can not reproduce this (probably it stuck on a bit of dillute oil first, but since the petrol or alcohol has evaporated and it's less sticky now) - it's probably ok, but I'd prefer to be sure now rather than finding out later the watch has stopped.Īny tips on cleaning the hairspring? I daren't take the hairspring collet off the balance since I lack the tools and the skill for this. Obviously the cleaning was not entirely successful. It ran well first, but when I inadvertently shook it a bit (I was winding it up with a screwdriver and slipped) the coils stuck together again and the movement stopped - there was this kind of "ringing" sound you hear when the hairspring is touching something. I have tried to clean it off by soaking in petrol and swabbing it off with some paper several times, and then the same with alcohol. Obvioulsy there is some on the hairspring as well, causing two coils to stick together and stopping the balance. I think I have identified the cause, the regulator pin (the part holding the hairspring) was soaked in some kind of viscous fluid, I guess silicone oil. I'm currently servicing a movement which used to stop occasionally.
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