Try wedging a flat blade screwdriver under the center part. Be careful not to damage the track, but there shouldn't be anything else holding it in there. Maybe the plastic decayed and swelled!!??!! Are there any notches in the track? Maybe someone modified the thing with a pin that slots into the track. If that is the case, you will have to remove a couple of rivets out of one end of the track and bang it out the end similar to removing the traveler car.
Good luck!
By the way, when you are done, buy a trailer mounted mast crutch. They are stronger and work better.
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