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Stem for a Seiko 5H26A-7A00

Iggy

By Iggy
in Watch Repairs Help & Advice

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Iggy New Member

Iggy

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I broke then lost the stem for my trusty old Seiko Quartz Diver about 10 years ago, I've been using it by taking the battery out and waiting till the correct time came round then putting the battery back in, spring and Autumn and every time it needs a new battery. I've tried searching online for the stem but have always come up blank for it. If anyone could advise me where I might find one both me and my trusty old watch would be very grateful. Iggy

jdm Distinguished Member

jdm

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Before buying a new stem/crown I would make sure that the broken portion can be removed and the watch works.

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Iggy New Member

Iggy

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Thank you very much everyone, you've been very helpful.  I contacted the seller on ebay that Marc suggested and he says it should fit ok so I'll try that.

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    • Mercurial
      Etachron regulation system

      By Mercurial · Posted

      Did you watch the whole video? Once Alex has set the stud, he first corrects the best error, then checks that the hairspring coils are breathing concentrically, then turns the stud to centre the hairspring between the open regulator pins.  He then checks that the regulator can traverse the terminal curve without disturbing the hairspring. A correction is needed, which he performs.  He then reinstalls the balance and re-centres the hairspring between the regulator pins, and verifies that the regulator traverses the terminal curve without disturbing the hairspring.  Finally, he demonstrates how to close the gap between pins.  He then recaps the whole process, fleshing out more detail. If you follow this process, you have correctly set up the regulator pins, and are ready to set the rate of the watch.  If you are interested in learning more about the effects of the regulator pin spacing on positional rates etc, you can read any literature regarding regulator pins. The etachron system makes adjusting beat, centering the hairspring between the regulator pins and adjusting the gap between the pins very convenient, but the same rules that apply to old style regulator pins apply to the etachron system.  This video explains the basics :    I hope that helps, Mark
    • Klassiker
      Etachron regulation system

      By Klassiker · Posted

      Some photos of the angles you are talking about, and the changes you are seeing to coil spacing etc. would be really useful. Part of your problem could be that you are closing the pins too far and pinching the hairspring. Adjusting the pin separation should not affect amplitude. Nor should it change the coil separation.
    • VWatchie
      Rolex cal. 3135 issues

      By VWatchie · Posted

      Did you try it on a Rolex ref. 16600 specifically? Congrats on the nice condition of the movement in your watch. Even so, remember to check the rotor play or those marks around the main plate may start to build up.
    • Kalanag
      Tissot case back removal

      By Kalanag · Posted

      Here is a method described in the watch repair book of Mark W. Wiles. Don‘t hammer, just tap very gently!
    • BobG
      Etachron regulation system

      By BobG · Posted

      Alex mentions the coils below the stud should remain the same as you move the regulator block along the terminal curve.  Mine do that. What he doesn’t discuss and is used in the other video is how the regulator block is used to adjust rate and positional error.  He also doesn’t mention how opening and closing the pins could and in my case does, alter amplitude  In Alex’s video once he sets the stud he never adjusts the regulator pins yet every new movement I get have the pins signing closed. 
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