Dynavector XV-1S

Pretty sure Steve at VAS offers this service as well. 

Needle clinic will retip your cartridge and get it back to you in less than 2 weeks. Andy is a stand up, no nonsense guy.

I second Needle Clinic.   Andy provides exceptional service!

Expert Stylus n the UK are very professional, do great work, promptly. I just had my Koetsu Urushi retipped by them. (New stylus only.) It took 3 weeks door to door, and I dare say the cartridge is better than ever.

I've used Soundsmith, VAS and Joseph Long in the past.  Long did the retip on my Dynavector XV-1s last May and I am very satisfied with the result.  Dynvector does not retip but will rebuild which involves going through their US distributor and back to Jp.  About 1/2 the price of buying new for the rebuild.  I'm in the NE of the US so VAS or Long would be my choices for a retip.  Their customer interaction in my experience is better than Soundsmith and I've made the trip in person to Soundsmith.