I used to use a guy in Perth city.. but I hear he's pulled the pin.
All about time in Balcatta have a good rep, it will take some time to get it back though as they're pretty busy.
Victoria Jeweller and Watchmaker in Vic Park isn't too bad. he's not quick but he does good work. the problem will be getting parts as Zenith is at best "boutique" here in WA.