ESFP (Exact Same * Problem) I think maybe the leading side of some Kliens or channelloks or something. I may have merely destructed it since I knew I'd be replacing nearly all the cracked-broke-crapped brackets anyway.
It may have just been as easy as a couple 1/4" extensions and a u-joint or two. I don't 'member.
Can you fish a box-open in from inside underneath with the door partially opened-closed?