I just wanted to chime in really quick about a retip of a Shelter 901 I just got back from Andy. I inspected it under a high powered USB microscope and work is really superb, perfect alignment and very clean replacement with a micro ridge nude stylus, sapphire/boron cantilever that appears to be much lower in mass than the original. As expected, detail retrieval has increased while retaining the core signature sound of the cartridge. I'm extremely happy with the work and recommend him highly.
He also turned this around in astonishing time (about a day); he apparently works on every cartridge himself and doesn't farm anything out. His queue at the moment appears to be low so if you have any work that needs done now is a great time to get it done.