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Having been repairing clocks for some years, I was told by my wife that watches take up a lot less room, so I have graduated? downsized? to watches.

Have been doing it for a couple of years, my main interest is vintage mechanical but now trying kinetic.  Watches, parts etc sourced mainly from eBay and learning all the time from YouTube videos.

My main problems are hairsprings, and cat hairs from our two resident mogg (oops, will be in trouble now ) non-moggy cats.

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Hi and welcome To The forum from another Old Twit,  Fortunate to have a bothy at the house end The misses dont go in there except for the freezer.  So a sanctuary with a buzzer iff needed  Ahhh Luxury

 

 

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Cats..I am allergic , I like  them, but I like breathing more . Dogs are more to my liking ,I see in them all the virtues we call human but are too ashamed to admit we learned from them.

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Having been repairing clocks for some years, I was told by my wife that watches take up a lot less room, so I have graduated? downsized? to watches.
Have been doing it for a couple of years, my main interest is vintage mechanical but now trying kinetic.  Watches, parts etc sourced mainly from eBay and learning all the time from YouTube videos.
My main problems are hairsprings, and cat hairs from our two resident mogg (oops, will be in trouble now ) non-moggy cats.

Welcome to a great group of like minded old men (probably).

We have 2 cats and a dog. Luckily I use a roll top desk for my watches. I dust the Tambour door before I open it and make sure all my parts are in dust cover trays until I’m ready to install them. Also, I have to wash my hands before I start. It is very much like surgery. I may be a bit over compensating, but it works pretty well.

Dust trays are relatively cheap. You could use a sheet of tissue paper or similar to cover your work area while you are away.

I’ve had watches stop on me only to to open them up days later to pull a very fine hair out of the works.

Keep trying. You will find something that works for you and it doesn’t have to cost a mint.


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Thanks for your thoughts,I have invested in a second hand air cleaner from ebay ,and now have clean air blowing over my work bench hoping that this will work. if not it should keep me cool in summer.

Regards, OldTwit

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    • Yes Cyma  R.408 is based on ETA 2724R.  
    • Yep. Tastes great; less filling.  Seems to clean jewel holes just as well as the “fancy” stuff. 
    • Hey thanks for all the info. But there was no mainspring in it. cheers gary
    • Take out the mainspring and measure the length. Go closest shorter mainspring. Shorter, you'll loose  some power reserve but otherwise should be fine. There are calculations to determine how long based on the area of barrel (see NAWCC website). Input the the ID of the barrel, the OD of the mainspring arbor, and the thickness of the spring. The idea is you fill a certain amount (about 1/2?) of the barrel area with coiled spring, with room for the spring to hold tension. Altering the thickness will change the torque available; increase, you can add too much and overbank, decrease thickness and you have too low amplitude. If it's a really old watch (not yours) you have to consider this, as older spring material was less powerful for the same thickness. I've read that watches with bad amplitude (or too much) after servicing can benefit from a different thickness, not a common case. Last resort, you could go for a smaller width, the spring would fit looser in the barrel but one size lower shouldn't really make too much of a difference (so I hear), although technically you want to re-size up the thickness in that case, and there's calculations for that. The last value you'll see on the cousins website is the size of the mainspring package, which should be equal or closest smaller size to the ID of the barrel. If you look at some similar ETA models you might get an idea of approximately how long the spring is, often it's listed with ranfft. Unfortunately for you, not for 272x series, nor the 26xx series, but there is for the 25xxs, and the 277x, so you might have some starting points there if the springs are the same for the other dimensions, barrel size, complications and rate. If you can find your mainspring size measurements, there's other styles of model numbers like the bestfit catalog number (usually a number and a letter), and if you know these you can often find NOS "white-a-loy" springs on ebay or elsewhere. There's scanned documents online from Marshal Handy, Bestfit, General Resorts, Nivaflex that will list more specs on your movement and mainspring. Like here: https://watchguy.co.uk/cgi-bin/mainsprings Some conflicting numbers in multiple entries for the eta2722, but you're seeing ETA2722 numbers similar to the ranfft data, with a length less between 360 and 400mm. Also seems to suggests your GR reference is this one available from cousins: 1.25 x .135 x 400 x 11 Automatic GR3150X Which at .135 is thicker than Ranfft's listed .125 (could be an error with Ranfft?), so you'll have to resolve that discrepancy with some more data points. Best to measure what's in there and/or look it up your movement in some more of those catalogues. Good luck        
    • Hey guys I am working on a cyma the only markings on the movement cyma R.408.00. Which is not in cousins or ranfft. So looked around and most people seem to think its a ETA 2722R,2724R or 2728R any way i need a mainspring and they dont make em any more so got measurements of ranfft 1.25x11x0.125 i put these in and it says there is none. It also wants length which i do not know. So what i am asking is what number is it best to fiddle around with so i can get a nearly correct mainspring. Its a nice watch so worth the effort. Its a auto as well. cheers gary
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