This not being the case but, is there no tolerance for screw pommels?
If not, i confess i am a sinner
. I had this cup hilted sword with both easily unscrewable knuckle guard fixation and pommel. I culdn't resist the temptation to dismount them, to better discern the maker's marks on the ricasso.
The result was positive on the mark visualization, and no visible harm occurred with the hilt patina
Fernando