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If the arm is sticking there really isn't much you can usually do but replace the icemaker itself. You could remove the icemaker if you wanted and then pry the front cover face off the icemaker to expose the head of the icemaker. Then you can remove the screws going into the head and pull the head of the icemaker off to see if you can use vasaline or something to lube the arm or file down some plastic that might be causing the arm to hang up, but if there isn't anything like that, the entire icemaker would need to be replaced.