How to repair a microwave door spring mechanism (taking care not to allow leakage from the microwave): I couldn't see any GE models but when I chose the new microwave I decided I could now take the risk of trying to repair my old microwave instead of splashing out 4 to 5k, as I was going to throw it out anyway. Also, looking at the microwaves in the stores, it was obvious the problem was inside the door. The plastic insert around the inner door flicked out easily and I had access to the mechanism inside - I found a broken attachment for the lower part of a spring (the original attachment they put in was metal but very flimsy). I needed something strong but tapering and so used the nozzle from a white glue container and strengthened it with a small wooden dowel rammed inside. (Any similar nozzle would do) - I cut it down (gradually) to fit, glued it in place and then put the spring loop on it. To hold the spring loop in place I used one of the ring-like pieces I cut off the nozzle earlier and glued that on. I replaced the door's plastic insert and the door now closes perfectly.
Having written this I must point out that radiation leaks from microwaves are dangerous (as I am sure everyone knows) and so repair them with caution. There is a time to throw away a microwave and buy a new one.