Gruen Autowind Rotor Attachment
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Thread: Gruen Autowind Rotor Attachment

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  1. #1
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    Gruen Autowind Rotor Attachment

    I bought this Gruen Automatic on ebay. Turns out it has an autowind rotor rattling around inside its case.

    How was this originally attached? Press fit? Swaged? Adhesive?

    How should I go about reattaching it to its arbor?

    Thanks.

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  2. #2
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    Re: Gruen Autowind Rotor Attachment

    Hello. I do not know this Gruen, but I suggest that a good place to start is to remove the plate that secures the rotor, and remove the shaft...you should then be able to get a very good look at the rotor / shaft mating area, and decide how to proceed...it looks as if it was a 'press fit', which might make it difficult to reassemble...perhaps a material search would come up with a replacement rotor ( at a decent price!), you'd then be in pretty good shape. Good luck with your Gruen...I'm sure it's repairable! Michael.
    pilotingpete likes this.

  3. #3
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    Re: Gruen Autowind Rotor Attachment

    Quote Originally Posted by Michael Maddan View Post
    Hello. I do not know this Gruen, but I suggest that a good place to start is to remove the plate that secures the rotor, and remove the shaft...you should then be able to get a very good look at the rotor / shaft mating area, and decide how to proceed...it looks as if it was a 'press fit', which might make it difficult to reassemble...perhaps a material search would come up with a replacement rotor ( at a decent price!), you'd then be in pretty good shape. Good luck with your Gruen...I'm sure it's repairable! Michael.
    Thanks. I used a staking set to tap the arbor onto the rotor. It seems to be held pretty well, although I haven't tested it on the watch yet.

    Unfortunately, I lost the click spring during disassembly and have not been able to find it.

    I'm wondering: is there a place to buy strips of spring that I can cut to length and bend a new one?


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  4. #4
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    Re: Gruen Autowind Rotor Attachment

    It's true: little pieces LOVE to fly away...never ( usually ) to return. I suggest finding another movement for parts...I've done this before, and it's almost always easier to remove parts from a second movement, than to find replacements...your Gruen is a rather common model, and with a bit of luck another will show up at a good price.

    Oh: to give yourself a very good chance to find errant piece(s): turn out the lights in the room ( complete darkness ), and use a really bright flashlight...it's impressive to see the little bastards that have tried to disappear, reappear under bright light! And: 99.999% of the time, they will be found where you KNOW they could not be...a person could write a book on the ' Inexplicable Tendencies of Impossibly Small Objects to Pop into and out of Existence'...! Michael.
    pilotingpete likes this.

  5. #5
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    Re: Gruen Autowind Rotor Attachment

    Quote Originally Posted by Michael Maddan View Post
    It's true: little pieces LOVE to fly away...never ( usually ) to return. I suggest finding another movement for parts...I've done this before, and it's almost always easier to remove parts from a second movement, than to find replacements...your Gruen is a rather common model, and with a bit of luck another will show up at a good price.

    Oh: to give yourself a very good chance to find errant piece(s): turn out the lights in the room ( complete darkness ), and use a really bright flashlight...it's impressive to see the little bastards that have tried to disappear, reappear under bright light! And: 99.999% of the time, they will be found where you KNOW they could not be...a person could write a book on the ' Inexplicable Tendencies of Impossibly Small Objects to Pop into and out of Existence'...! Michael.
    Thanks, Michael.


    Sent from my iPhone using Tapatalk

  6. #6
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    Re: Gruen Autowind Rotor Attachment

    Quote Originally Posted by pilotingpete View Post
    Thanks. I used a staking set to tap the arbor onto the rotor. It seems to be held pretty well, although I haven't tested it on the watch yet.

    Unfortunately, I lost the click spring during disassembly and have not been able to find it.

    I'm wondering: is there a place to buy strips of spring that I can cut to length and bend a new one?


    Sent from my iPhone using Tapatalk
    A strong magnet and a thorough sweep will find almost any ferrous containing part. I use a permanent magnet rotor from a submersible pond pump. Regards, BG
    pilotingpete likes this.

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