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  1. #11

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    Quote Originally Posted by okto View Post
    I misplaced the ball bearing that serves as the click-stop mechanism on my Pentax-M 50/2 lens; does anyone know where to get a ball bearing that small? It's probably about 1-2mm in diameter.
    .05mm in size. Micro-tools carries them.

  2. #12

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    Quote Originally Posted by Kiron Kid View Post
    .05mm in size. Micro-tools carries them.
    A ball of .05 mm is very, very small...

  3. #13

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    Sep 2013
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    I'm reading this a few years late, but thanks for the ball point pen idea! Saved the day.

  4. #14

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    Quote Originally Posted by okto View Post
    Well, since my first post I managed to jam the replacement ball bearing in its slot, and it's not coming out. Good thing this was a cheap lens, cos it's toast now.
    Thanks for all the help though!
    Drill to side of ball with a 1mm Morse drill stick in spike and lever out, you can live without click stops.
    Or salve hole and start again.
    Any repair person would want a lens for parts.
    If you have a scrap computer disc drive they normally have a few small balls.

  5. #15
    Europan's Avatar
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    My tool dealer has them per ten, hundreds or thousands.

    http://www.brw.ch/shop/produkte/deta...ools=&t_Node=0

  6. #16
    David Lyga's Avatar
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    I believe that this particular one is one of the larger, perhaps 1mm diameter or a bit more, for this Pentax lens.

    In the future, when removing that aperture ring, do so in a clear food storage bag so that nothing goes flying.

    Nota Bene for all: for literally more than a decade I have been saving tiny screws, ball bearings, tiny springs, etc, that I have garnered though junk bodies and lenses that I am not able to fix. I save these precious tiny parts in small, plastic coin rolls that have a screw on cap. This is probably the most valuable source of parts that I have and I recommend that, before you through anything out, you scavange these tiny parts. They WILL save your day. - David Lyga
    Last edited by David Lyga; 12-09-2013 at 03:38 PM. Click to view previous post history.

  7. #17

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    If you haven't found some drop me a PM with your address.
    I have 100 new 1 mm sitting unused.
    Easy to zip-lock 5 or 10 in an envelope and send them your way.

  8. #18
    lxdude's Avatar
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    Quote Originally Posted by David Lyga View Post
    I believe that this particular one is one of the larger, perhaps 1mm diameter or a bit more, for this Pentax lens.

    In the future, when removing that aperture ring, do so in a clear food storage bag so that nothing goes flying.

    Nota Bene for all: for literally more than a decade I have been saving tiny screws, ball bearings, tiny springs, etc, that I have garnered though junk bodies and lenses that I am not able to fix. I save these precious tiny parts in small, plastic coin rolls that have a screw on cap. This is probably the most valuable source of parts that I have and I recommend that, before you through anything out, you scavange these tiny parts. They WILL save your day. - David Lyga
    Great advice, David. I always do the same.
    I do use a digital device in my photographic pursuits when necessary.
    When someone rags on me for using film, I use a middle digit, upraised.

  9. #19

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    Jun 2009
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    Thanks for that tip David. I always lay everything out on a nice clean rag or towel before taking anything like that apart, but it's of scant help if something flies off, as has happened more than once. I actually found one of those little bearings once when it flew off into the shag carpet. What's the odds of me doing that again? Nada. From now on, in the bag she goes first hand.

  10. #20
    David Lyga's Avatar
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    Coarse rags or towels also help to prevent ball bearings from rolling away.

    I forgot: is the 2/50 pentax the M42 or the PK mount? The PK mount one has a tiny, tiny ball bearing that GOES FLYING when you take off that aperture ring. The older, M42 lens has a LARGE ball bearing, maybe 2 ml even, and is easier to manage.

    If my walls had memory and vocal chords they would be able to recant the swearing that I have done over the years about these utter frustrations. - David Lyga

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