Ugh, I also have a JINAH tremolo on my 1989 Korean Epiphone Strat-style guitar. Like others, the tremolo block crumbled where the threaded bushing screwed into it for the tremolo arm.
MiserysSaint, did you end up trying the Fastloader locking Trem System from Guitarfetish? If so, did it work? Mine looks exactly like the picture in the original post, but the on-center distance for my studs seems more like 73mm than 71mm.