Which side of an over-tightened brass NPT joint needs to be replaced?
Try this; take the fitting back apart. Put 2-3 wraps of teflon tape (no more than 3). then coat the male threads with RTV silicone caulking. snug as normal and let set overnight. I would normally not use the teflon tape but the brass has been stretched and enlarged by the over tightening. When I as still working I would put whole jobs together using only RTV silicone and no pipe dope or teflon tape.