Leaky Dichro Head

Discussion in 'Darkroom Equipment' started by Dick Sheppard, Sep 11, 2009.

  1. Dick Sheppard

    Dick Sheppard Member

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    My ancient Beseler 4545 head has sprung a giant light leak. I opened the
    top lid to check some stuff and now the #%//<*?+ will not stay closed!!
    The plastic screw down bolts refuse to engage the hole in the case of the
    head. These bolts are a two piece, spring-loaded affair that I cannot make
    function. I suspect I am surely not the first person to become enraged
    at these little rascals. Your suggestions appreciated, other than plenty of gaffers tape to hold it down.
     
  2. Mike Wilde

    Mike Wilde Member

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    Get a roll of cinefoil. Matte black on both sides heavy duty tin foil. It stops light leaks on 1000W theatre lights, so an enlarger head will not put a 'dint' to the coating. Fold it to suit and make a new lid.

    This stuff has a ton of uses in stidio settings as well. Paired with a pair of pliers, and a collection of dying coat hangers, and light modifiers spring to life with almost no cost.
     
  3. Dick Sheppard

    Dick Sheppard Member

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    Light Leaking Dichro Head

    Thanks for your suggestion. The problem is that head has a 4x5 Diffusion
    Mixing Chamber, and sticking out of this is yet another light sensor. The
    inside of the metal the hinged metal cover has semi-circular spring steel
    coil which rests on the light arttenuator and requires considerable pressure
    to close, perhaps 10-12 pounds. I assume this device is designed to keep
    the Diffusion Cahmber firmly in place. It also assures that if the bolts do no
    do their part in holding it down, the lid goes sproooiiiiinggg open. So, the
    solution seems to be limited to snugging the lid into place without the bolts
    if I can't figure out how they are supposed to work. Yards of gaffers tape,
    duct tape, or ropes maybe. Fortunately, I have a good condenser hear for
    use, but I like the Dichro.

    Anyway, thanks for offering a possibility.
     
  4. ic-racer

    ic-racer Member

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    Could you post a picture of the problem?
     
  5. Chan Tran

    Chan Tran Member

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    I know the problem. I had to use tape for a while and then latter I use some screws to screw it down.
     
  6. Dick Sheppard

    Dick Sheppard Member

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    Can't do it Chan. I have no digital camera equipment and don't know how to use it. I am still
    operating photographically pretty much as I did before digital came on the scene.
     
  7. Curt

    Curt Subscriber

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    Are they heat warped, is the fan working as it should?
     
  8. Dick Sheppard

    Dick Sheppard Member

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    No heat warping, fan working just fine. It is just that the fasteners don't function, or that I don'how to twist them correctly after all these years.
     
  9. Curt

    Curt Subscriber

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    I just push down and with a partial turn and it locks.
     
  10. Dick Sheppard

    Dick Sheppard Member

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    Curt, that was how it was for years, just turn and lock. Doesn't work
    these days. Gotta come up with anotnher solution. Thanks for your
    interest.