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grimpil

OBTAINING A REPLACEMENT MAINSPRING

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Greetings, I am brand new to this world having bought an old pocket watch at a car boot fair. It doesn't work so I challenged myself to get it working and have been teaching myself via online videos and books. Now I'm hooked! I bought an old book in a second hand book shop for £2 called Practical watch Repairing by Donald de Carle. The watch is small and has been converted to wear on the wrist by having 2 lugs soldered on, but the winder is still at 12 o'clock so it must have been a bit awkward to view really. There is no makers name, but it is a silver case and this dates to 1910. the movement is swiss, case English. Roman numerals. Anyway, I have stripped it down and it has a broken mainspring so I'm looking to buy a new one. I'm finding it a bit confusing when searching and want to get the right one or one as near as possible that will it. I've successfully measured the height, thickness and length using a digital calliper. Where is the best place that I can get a replacement mainspring? Some are noted in sizes beginning with the letter M, but that means nothing to me. All advice gratefully received from those with more experience than I. many thanks.

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If you know all the measurements you could probably get one from Cousins as you’ve got the info you require 

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First the book by Donald de clark is the bible of watch repair.

In General, If the watch mentions a caliber, you can visit  ranfft.com. or you can follow directions to ID the movement by shape of the set mech. 

You can post a thread for help to identify it, Show pic of the movement.

You may come to need another part, so movement identification is of paramount importance.

Good luck

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