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Cable releases will not operate shutter of Pentax A3

I have three cable releases of different lengths. All fit the tapering thread, but will not operate the shutter

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Take one of the cable releases and press the thumb pad and extend the release probe. Lock the release in the fully extended position. Try inserting the probe into the shutter release hole and see if it works. If not then try using a thick needle from the head end and see if the release actually works on the camera. If it does then measure the depth that the needle goes to in order to work the shutter and compare to the exposed length of the release cable. You may find that it is not long enough although I would have thought unlikely.

Posted on Oct 02, 2009

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26313356-3kt1rk2qq1yye1uaamrjudob-5-0.jpg morse taper

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Common American National Standard Pipe Taper Threads
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(inches) Threads per Inch
TPI - pitch Approximate Length of Thread (inches) Approximate Number of Threads to be Cut Approximate Total thread Makeup, Hand and Wrench (inches) Nominal Outside Pipe Diameter
OD
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