How can I fix a rear hinge on my HP All-in-One Printer?

How can I fix a rear hinge on my HP 6210 All-in-One Printer? Evidently, this is a common problem on these HP printers. HP does not sell replacement hinges and when you call customer support, they try to sell you an upgraded, new model. My printer is just a few years old. It's fairly obvious that HP designed these hinges to fail over time as the center, fulcrum point of the hinge has the adjoining pieces of plastic molded together in only about 20% of the surface area. It's like a car maker who doesn't sell replacement steering wheels and no others will fit, causing you the need to buy a whole new car. Help, please!