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The most common failure in the Pentax Auto 110 is that the wind mechanism starts to slip with age.  In general this isn't a camera that you want to send off and pay a high price for servicing, but luckily the fault can usually be fixed by a moderately handy individual.  The problem stems from the use of friction joint in the wind gear train.  The joint consists of a coil spring that is tightly wound around a gear shaft.  On one end, a spring coil is bent up into a pin that fits into a small hole in a rotating plate (seen near the red arrow above).  Rotational force is transmitted to the gear below it by the frictional force between the spring and the gear shaft.  Over time this frictional force diminishes, probably due to some combination of surface wear, contaminants and material creep, and then only slight resistance causes the joint to slip, rendering the camera useless.

 There are several potential ways to fix this problem.  The first thing that is required to fix the camera remove the bottom plate, then remove the lock ring from the long linkage connected to the rotating plate (see red arrow above) being careful not to lose it.  The linkage can then be lifted over its pin and moved out of the way.  Then you need to remove the screw holding the rotating plate.  It will lift out and the gear shaft with spring will be found beneath it.  You then should pull the spring off the gear shaft.  I cleaned both the spring and shaft with acetone to remove any contaminants that may be reducing my coefficient of friction.  Then to tighten up the joint I used some jeweler's pliers and bent a few of the coils down to a smaller diameter and then reassembled the camera.  I have run a number of rolls of film through my camera without any problems.

A second known failure occurs when the little bent spring pin snaps off.  If a new spring can not be located (yeah, good luck!) you can simply bend up a new pin from the top spring coil (though bending a small length of spring steel might be a little tricky as you don't want it to go off flying across the room!).

While fixing my camera I made the mental decision that should the joint start slipping again I would just use some permanent Loctite type adhesive on the joint and be done with it.  The flaw in this design, as I see it, is that a friction joint was incorporated into the design presumably to protect the lightweight linkage and gear train from damage, but in the process it introduces a feature that almost insures a total failure of the mechanism.  If adhesive was used on this joint you would want to be careful not to force the camera if the film started to bind (and film binding in a 110 cartridge is not uncommon).