i second what Eddie said about drilling a hole in the zerk. dint think it through to the detail; only applies to getting screws out. the zerks i ahve dealt with lately already have a hole that my hansen set will fit to back out; they are also very, very cheap metal...soft. if you try to dril a bigger hole in the broken zerk 'shaft', you will likely mess the threads up in the part that is 'zerked'....i don't think they make 'helicoils' that small (joking ) the small file handel, if there is room, sounds to me like it would work-maybe even filing a nail, or using a small screwdriver, if the zerk you got is as soft as the one that was in my gate (i swear, i think the thing was aluminum-tossed it, or i'd put a magnet to it and see)...invention, the mother of us all lol!
rebb
rebb