It all depends on who you use. I'd check out Expert Stylus Company They have a stellar reputation and appear to be the most trusted name in examination, repair and overhaul of high end cartridges.
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I have heard good things also about them. I just had a Denon 304 cantilever replaced by Soundsmith. It is larger than the original but sounds fine. It was $162 including return postage. I am going to have them do 2 more for me. Expert might well do a better job, although the Denon is not yet broken in and it sounds as good as I ever remember it sounding, but the expense and wait time will probably be 2 to 3 times as great according to what I have read on the web.
Easily worth it compared to the cost of a new cartridge.
I brought both my fidelity research cartridges back to life by sending to Mr. Van den Hul. He did a fantastic job and both sound great, plus I get to keep the cartridges that blew me away in like 1980.
I bought a broke Ort Kontrapunkt B and sent it to soundsmith recently as I have heard that he does great work.
Have a couple years on my vdh fr's and they still sound and track great.