In the UK, I can completely recommend Expert Stylus. They have retipped three of my cartridges, an EMT, an Ortofon and an AT. Excellent service at a sensible price.
I had a terrible experience with another cartridge refurbisher who ruined my EMT, and it had to go back to the factory for them to correct the damage, which of course the refurbisher denied.
With Expert Stylus, no such problems and superb stylus profile. They supply their own Paratrace stylus which is similar to the vdh.
S