| sounds like your derailer is missing (the gear shift thing). to shorten the chain you need a punch set, a hammer, a brick or something else solid, and a pair of pliers. figure out how short you need the chain, set the link you want to remove over the hole in the brick, put the punch against the pin holding it together, and hit it with the hammer a couple times. it should come apart. then take the other end of the chain, and pound it together around where you need it.
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