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It is probably gummed up with old hard grease .Pull it apart clean it all up in thinners,lubricate the paddle with Vaseline put it back together in reverse. Very simple to do, it is not complicated, doesn't take much time and any "dumba*ss" should be able to do it. Give it ago yourself. I have done two of these, there's nothing much you can do wrong, it will be cheaper and you will have a sense of achievement.
GB