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    • Same issue I have the 1900 which has that naughty spring as well. As a precaution I have the holder sitting on a large duster to soften the blow if it drops out.
    • I'm following this. Case restoration is most important its knowing when to stop as it is easy to damage what has built up over the years. 
    • If you look at the link of the pocketwatch database for the serial number and you go to the parts list you can go to Springs and I snipped out an image. So we have an Elgin part number and a strength as an added bonus you click on the part number and you get this link https://pocketwatchdatabase.com/search/result/elgin/9785822/parts/catalog/X791/250 Fortunately it looks like that particular hairspring goes in a lot of different watches. That's the good news the bad news is we still have to find one and you're going to have to play with the screws to bring it in to time. When I get a chance I'll go look at my Elgin parts catalog and see what it says about the hairspring if there's any other additional information. Then that is assuming that it just needs a hairspring and that it doesn't have a broken balance staff more than likely it's going to need a main spraying and if you're lucky that's all that's going to be wrong with. I don't like when parts are missing like any parts it suggests other things could be missing were not even right. As one of the cautions of buying off of eBay it might look nice and pretty in the picture but in real life that doesn't always agree with the pictures. On the other hand the watch that I bought that wasn't quite what should be scrapped for parts because I really needed one of the parts off the watch so it worked out at the end.    
    • Dr ranfft shows 18 size HS to have come both in flat and berguet. Will you show a side view close up of the balance? I suppose you can go by serial No as well to find out the hairspring type.  Building the complete balance on these is challanging. 
    • In case anyone is having trouble curing their UV cure products, check the UV curing light. Most nail curing lights are using UVA leds with a wavelength of 365 to 405nm. These tend to have a low output and some manufacturers apply higher currents than recommended to increase output. This unfortunately will shorten the lifespan of the LED. The bad news is it will still lights up but the useful UVA part of the spectrum is gone. Hence your varnish or glue won't cure properly. Another problem is using a dental curing light for curing UV gels. Our dental curing lights are actually using blue light with a wavelength of 450nm. There is absolutely no no UVA. It is designed to be safer for eyes. Hope this info helps.
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