What holds part # 39-529 to the operator

A quick learner from Orange CA says:
November 16, 2017
What holds the arm to part number 39-529. There is a pin on the arm but the arm keeps falling off part # 39-529.
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Tom from SWISCO responded:
November 21, 2017
The pin at the end of the operator arm should be all that's necessary. The 39-529 just pops on and should stay in place. If yours keeps falling out, it's possible that either the track slider is worn out, or the pin itself.
Truth Hardware Track Slider
Truth Hardware Track Slider
39-529
$1.20
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