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  1. #1
    pellicle's Avatar
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    disassembly of a prontor shutter (from a folder)

    Hi

    I have been pondering repairing a prontor shutter in an old folder which sticks on speeds below 25th. I've read on some forums that it can perhaps be removed from the camera, the lens elements taken off and then soaked in some lighter fluid to dissolve the gunked up lubricants.

    I've managed to get the front off (and the distance scale) without problems, however I've come unstuck at this point



    I had thought that this metal section should simply unscrew, but it doesn't (simply, it seems to want to fight about it). By the way, thats a magnet tool there, not a broken screwdriver (I'm not that rough) .



    In fact you can see a small mark that I put on it from my attempt. Now, even though I (thought) I was careful I've observed that I've put small dent in this ring (you can just see it in the image in the exact left hand side of the ring (the "focus" marker is pointing to it). I only noticed this upon taking and posting these images.

    So, my questions are:

    1. how can I best unscrew this to expose my shutter
    2. what's the best strategy for straightening that ring?


    I was thinking of shaping some doweling wood and using that with a small hammer to tap it straight (hoping that the wood will damage the thread).

    So, should I continue with this, or just get a whole new "unit" off ebay?
    Thanks
    Theory: you understand why it should work but it doesn't
    Practice: it works but you have no idea how
    Here theory and practice meet, things don't work and I don't know why
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  2. #2

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    Quote Originally Posted by pellicle View Post

    I was thinking of shaping some doweling wood and using that with a small hammer to tap it straight (hoping that the wood will damage the thread).

    So, should I continue with this, or just get a whole new "unit" off ebay?
    Thanks
    The wooden dowel trick works quite nicely. Dont get another unit yet: milk this one for what its worth!

    Sometimes getting the front dial off is totally unobvious. I suspect you still need to unscrew one more bit, the bit youve been fighting. See http://www.rolandandcaroline.co.uk/r...prontors1.html. Also the pages around http://pheugo.com/cameras/index.php?page=klio are worth a look.
    I had one where all I had to do was lift the shutter dial and it all came off.

    What camera was it from? Sometimes specific instructions are available.

  3. #3
    pellicle's Avatar
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    Hi

    Quote Originally Posted by bnstein View Post
    The wooden dowel trick works quite nicely. Dont get another unit yet: milk this one for what its worth!

    Sometimes getting the front dial off is totally unobvious. I suspect you still need to unscrew one more bit, the bit youve been fighting. See http://www.rolandandcaroline.co.uk/r...prontors1.html. Also the pages around http://pheugo.com/cameras/index.php?page=klio are worth a look.
    I had one where all I had to do was lift the shutter dial and it all came off.

    What camera was it from? Sometimes specific instructions are available.
    you know, I came here to report that I was ready to declare it a lost cause.

    Thanks for the encouragement / attitude re-adjustment.

    Anyway, I've gone over it a few times with the wooden dowel and the rim sat in a bit of pine cut to a V and now its looking good.

    While I can't see any 'out of plumb' areas but it must be out by a quarter of a smidgen somewhere, as I can just get it on (and to tighten down) with the help of a "rubber strap" wrapped around the front element to give me purchase. I know its not cross threaded as when I take it off the thread looks perfect.

    Thanks for the links ... I'll have a go more.

    do you know what makes me cry?

    I just put a few drops of lighter fluid around the rim there to loosen up the core and it must have seeped into the mechanism and done the trick cos the bloody shutter is now working perfectly now.

    Now my next trick will be getting it back onto the camera as when I tried to refit lastnight I found that the rear collar sticks up past the bellows preventing me from tightening the collar up. I can't sus out how to get this tightened back without it then pinching the bellows at the end. (Pictures will be posted if people don't get this description.

    The camera is a Bessa I
    Theory: you understand why it should work but it doesn't
    Practice: it works but you have no idea how
    Here theory and practice meet, things don't work and I don't know why
    Homepages: here Blog: here

  4. #4

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    If you file 2 small notches in the rim of that piece, then using a straight edge accross, you'll be able to unscrew it.
    Anyone can make a Digital print, but only a photographer can make a photograph.

  5. #5
    jsfyfe's Avatar
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    Flexiclamps from Micro-Tools work very nicely for removing lens elements without damage. They come in a variety of sizes.

    http://www.micro-tools.com/store/ite...emCode=FLX-9-A

    They also have a European site.

    http://www.micro-tools.com/Merchant2...Store_Code=MTE

  6. #6
    pellicle's Avatar
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    sweet :-)

    thanks folks ... I'll try both, notch first (zero dollar solution) tool second ;-)
    Theory: you understand why it should work but it doesn't
    Practice: it works but you have no idea how
    Here theory and practice meet, things don't work and I don't know why
    Homepages: here Blog: here

  7. #7

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    beware of the scenario I had with my Yashica LM, I lighter-fluid soaked the shutter and it worked, until I got it back in the camera grrrrrrrrrrrrrrrrrrrrrrrr. I read on some forums that lighter fluid will just spread lube everywhere and after a few days it will gum up again. I resorted to electrical contact cleaner (make sure its ok to use on rubber) and it worked like a dream....

  8. #8
    pellicle's Avatar
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    Sausage

    good point!

    thanks
    Theory: you understand why it should work but it doesn't
    Practice: it works but you have no idea how
    Here theory and practice meet, things don't work and I don't know why
    Homepages: here Blog: here

  9. #9
    Andrew Moxom's Avatar
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    Try a neoprene jar lid remover. Place the lens/shutter lens down onto this and then while holding the shutter body, uncscrew it. Anything that puts stress against the thread by pinching will jam it tight... Hence your dent!
    Please check out my website www.amoxomphotography.com and APUG Portfolio .....



 

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