How do I remove knuckles, cleanly? Knuckle recovering.

[gordon stelter]

I may be getting in a Conover grand with a good set of
new hammers, but utterly flat knuckles 
( Authentic 1915 vintage ).
     Can anyone recommend a recipe for removing them
for replacement or recovering, without breaking the
shanks or the knuckle cores? And must they be removed
for recovering?
     Your comments would be most sincerely
appreciated.
     Thanks!
     Thump

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