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Phil,Thank you for the informative instructions on the rollers and bearings. Our model Achiever was purchased new in 1989. What I have found very helpful for lubrication (after flushing the bushings, bearings and cleaning the shafts) is a product used for garage doors rollers and hinges called: Blaster Garage Door Lubricant. It works quite well and can easily be found for purchase. On the rubber rollers I use an automotive detailing product called: Ultima Tire & Trim Guard+ (this product is a bit pricey as it is a polymer coating, but you can use it on your vehicles with excellent results).
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