Based in Melbourne, Australia. Specializing in Onoto plunger fillers and Vacumatic's. Daniel Kirchheimer - Provides a very specialized service to collectors of vintage fountain pens. He can also remove, or significantly reduce, dents and dings on Parker 51 caps, and offers a few other restoration services as well. A prompt and helpful service is assured, whether for a basic overhaul or more complex mechanism such as Parker Vacumatic's or Sheaffer's snorkels, etc., Can provide nib and other parts replacement.
Advice is always freely available.
Cullen Rankin - Conducts restoration work on fountain pens. Including repairing dinged caps, plus cracks and chips in Hard Rubber and Plastic pens. Offers a good selection of replacement sacs and diaphragms for Vintage fountain pens. They also offer a catalog of various sizes through their web site.