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Re: Cable releases will not operate shutter of Pentax A3
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.
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the critical details of a plug are
the thread diameter
the thread length
the method of sealing---copper washer or taper seat
when in a bind any make of plug that conforms to those three requirements will work
the d indicates a 12mm thread size
the e indicates a 19 mm reach--thread length
the r is resistor type
the a is the construction type
the 8 or 7 is the heat range --both close to middle of the range
if the thread is too long, combustion material will settle in the threads exposed and will strip the threads out of the head when removing the plugs
if the thread is too short , combustion material will fill up the threads in the head making it impossible to fit the correct plugs
if the thread is too long there is a possibility that the end of the plug will hit the piston top
you can have the correct length but some plugs have a taper seat to seal and others have a copper gasket
the plugs will not seat properly and will be difficult to keep tight or sealed off
if you mean by "wrong plugs" the wrong being different makes or numbers on the plugs there will be nothing wrong as all that matters is the thread size and length and seat seal
You will need an external shutter release that locks. Connect the shutter release, then on the camera set the shutter dial to B (bulb). With the shutter release cable fire the camera and lock the plunger, or hold it down. Using a shutter release cable you are less likely to cause camera shake. Of course have the camera on a tripod or something steady.
Compare the old cable to the new cable. The outside casings should be the same length and the Inside cable should also be the same length. The dealer may have supplied you with the wrong cable. If the cable is the correct one then check the positioning of the clutch release cam.
Common American National Standard Pipe Taper Threads
NPT - National Pipe Thread Taper
FPT - female (internal) National Pipe Taper threads
MPT - male (external) National Pipe Taper threads
NPTF - Dryseal American National Standard Taper Pipe Thread (ANSI B1.20.3)
For NPT threads a sealant compound or Teflon tape must be used for a leak-free seal. For NPTF no sealant is needed for a sealing.
Characteristics of NPT (also known as ANSI/ASME B1.20.1 Pipe Threads, General Purpose):
tapered thread 1o 47'
truncation of roots and crests are flat
60o thread angle
pitch is measured in threads per inch
Note! Pipe sizes do not refer to any physical dimensions. The outside diameter of a pipe or fitting must be measured and compared to a table for size identification. A 3/4" NPT pipe thread has an outside diameter - OD - of 1.050 inches.
Each thread size has a defined number of threads per inch - TPI, or pitch. The 3/4" NPT pipe thread has 14 threads per inch. Both the TPI and OD of the thread are required for positive identification of thread size because more than one size have the same TPI.
NPT - American Standard Pipe Thread Taper 1)
Pipe Size (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 (inches)
Tap Drill (inches)
1) The taper is 1/16 inch in an inch, which is the same as 3/4 inch in a foot (angle 1o 47')
NPT threads are not interchangeable with NPS - National Pipe Straight - threads.
NPT threads may look similar to ISO 7/1 threads. However, ISO and NPT threads should not be mixed. ISO threads have 55o taper angle versus 60o for NPT. The NPT root and crest configurations are also different from ISO. For ISO threads pitch is usually measured in millimeters (may be expressed in Inch). The pitch are different.