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This uses a Goshen lift system and if you go to the following link you can get what you need in the way of parts. Some Forest River dealers would have these as well. Hope this proves helpful here. Please get back to me if you need more as all follow ups are included in our fee. R.J. http://www.popupparts.com/index.php?main_page=index&cPath=4_9
Those were usually an add-on. Does it have any name on it as there were several used? Does it appear that it is stuck or is it possible that there is a different problem?