Recently I had a customer that inquired about this particular product, naturally i went straight to the source and found that the opener was made by clopay and they discontinued production sometime in the early 80's. meaning that they no longer carry replacement parts...the only way you would ever find one is if some one out there has saved an old duralift opener or had a stock pile of parts. Other than that you would be better off buying a new opener...I would be interested to know if there is a drive kit made by liftmaster or genie that would fit the old duralift opener.
Thank you
Mike www.prodoorsupply.com