if you lose some material it might go down to about a FOS 3.5
Nobody died in the making of this thread…
Drill it out till the two halves of the SFN are separated, then twist them to the side, fold them, and remove them.
A mate of mine didn’t loose his face after a corroded steerer failed because of an old SFN at Morzine, but now I’m all about not mixing different metals there.