I have an older Sportscraft tent trailer that goes up and down by chain. All of a sudden the last time we used it the back goes all the way down, but the front doesnt and then when we try to put it up again the front gets all the way to the top but the back only goes about 3/4 of the way. Any suggestions? The chains are still intact, although the back one seems a lot tighter and there is no obstruction around the crank that runs through the trailer.
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