In the late 70s and 80s the two Garrott Brothers built up a reputation for their phono cartridge retipping service and a cartridge called the P77. They supplied a high quality “parabolic” diamond stylus and were able to fit it to practically any phono cartridge, including moving coil types. Len Gregory (The Cartridge Man) was their agent in the U.K.
The brothers both died in 1992 and the business was purchased by Audio Dynamics in Melbourne. They still offer a retipping service but with a range of stylus profiles (round, elliptical, microtracer, MicroScanner MkII, Fritz Geiger Signature). They also now have an extended range of moving magnet and moving coil cartridges which have been highly reviewed.