Assuming you have the common RestEasy sofa.....
The worm gears run in a cavity in the sofa arms. Remove the arms. Four bolts on each. Accessed from underneath after you have extended the foot rest. The worm and traveler will be attached to the sofa frame. The traveler is plastic (nylon?), sort of tee shaped. Free the keeper and swing the worm out to free the traveler from its track, then rotate the traveler(s) until each is equidistant from the end of its worm. ( Doesn't matter which end of the worms, just the same distance right hand worm and left hand worm. In operation, the motor runs the worms until they reach stops. they just need to reach the stops in unison.)
Then swing the worm/travelers back to their track, replace keeper, replace arms, replace footrest, test run, take pride in another task accomplished!
If you have another brand, principle will be the same.
Fair Winds and Following Seas.
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