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if there brass back nuts a sharp metal chisel will split them easier done on a cast iron bath as you,ve got something to push against if its a steel bath i maybe wouldnt try it another possability is to take the tap head off and use a starritt type cutter and go right down through the seating similar to the reamer idea both idea,s are perhaps more suited to someone with a bit of experience as theres no going back my third suggestion is get a plumber its not a job for the faint hearted