Elevator trim

The elevator trim consists of a crank/pulley in the cockpit.

Connected by a 1/16" cable to the trim mechanism in the horizontal stab.

And by a rocker arm to the elevator trim tab.

The trim mechanism needed cleaning and lube.   The rocker arm bushing are made of 1/4 OD brass tube available from hobby stores and fine hardware stores.  My pulleys were both in very rough shape.  I had to re-form the groove on the forward pulley to make it a sharp "V" so it will grip the cable.

I chucked the pulley in the drill press and then used a "knife edge" needle file to form the groove.  I also found it necessary to repair the outer edge of the pulley which was chipped and broken.

 

I used epoxy resin and a few strands of glass liberated from the fringe of a glass deck cloth.  The ID is formed by an old spray paint can lid, and the groove is formed by masking tape.  The pulley was then sanded (on the drill press) and painted.  The light colored portion of the rim in the picture above is the repair.

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