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Thread: power drum sliding on B&L 70 lensometer

  1. #1
    Rising Star
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    Mar 2001
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    Harleysville PA
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    power drum sliding on B&L 70 lensometer

    I recently acquired one of these in terrific condition with one exception, the power drum slide tension is too loose.

    I seem to remember having a similar problem with one years ago and it being a pretty easy fix, but I have the cover off and I'm not seeing it. Can anyone assist? Bonus points for pictures :)

  2. #2
    Rising Star
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    Nov 2008
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    Waltham, MA
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    Other Optical Manufacturer or Vendor
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    67
    There is a friction adjustment under the instrument. Unplug the Vertometer. There are two small screws that hold a cover on the bottom of the instrument. Try not to loose the little screws, they are a sort of uncommon thread size like most of the screws used on the instrument. You will see some setscrews that press on a flat spring that presses against the power shaft, tighten the screws slightly to put more pressure on the spring

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