I did it once. I was very young and the well was in a place where it couldn't be accessed by the pump hoist. I said I was young, not stupid. I didn't try to pull the jet by hand. I used the almost waterlogged 82 gallon tank as my water source and my little compresser that I carried around for blowing out galvanized tanks. After about an hour of plumbing to get the tank hooked to the casing adaptor in a reverse flow direction I pumped the tank up to 60 psi (that's all the compressor would do) and opened a ball valve to let the water fly all over the guys basement. It actually worked and he was back in water. I don't know how long it lasted as I never heard back from him again. Maybe the water in the basement bothered his wife, who knows? Hey, they had water again!
I won't try it again, it's not worth it. I should have told him he needed a new well because it's going to happen again since he's using the same pump, casing adaptor and droppipe. Like Gary said, it's all scaled up and it's just a matter of time before it plugs again.
bob...