You're lucky you got yours back. Most folks never see theirs again. The top of the lifter shaft was attached by pressure that expanded to fit over the top of the opening in the hinged angle piece that's broken on yours (sort of like a grommet on a tarp, if you know what I'm referring to). I've seen a few that were repaired by tapping into the shaft and using a machine screw with a wide head to hold it in place. As for the two broken parts that you have, I'm not sure those will be repairable unless you're a patient metal worker with the right tools.