[Healeys] steering wheel removal

[Vern]

Sorry if this looks like more of the same, but
I am currently disassembling my 57 BN4 healey.
In attempting to remove the steering wheel I put on
a little PB Blaster and after a while  the wheel appeared
to  break loose.  It seems loose and moved about a quarter
inch toward off, then hit with a clunk.  just far enough that
with the nut on a few threads it is against the wheel so
I can't pound on it. I can't emagine what could be catching
it.  Anyone had this happen?  I couldn't find anything in
the archives
Vern