This is actually on my 74 Bronco that I just installed my rebuilt C4....The prior owner used some sort of bronze adapter that I tried to remove but broke off the head so I now have a sleeve of bronze inside the hole for the cooling line. Don't have room for a drill. Was thinking of a small needle file or mini hack saw...seen blades with teeth for Xacto knife maybe.....cut a slot and chisel out. Dunno. Too tight to remove with easy out and don't want to break that off in there! Any ideas? I have some working room but not enough for a drill unless I get one of those 90 deg things.... Thanks, Mike