Steve Hooker out at Silverdale is the man to see for shot peening/crack testing, etc. He does a lot of work for shops in Western Sydney. Might be a bit far from the Central Coast though!
You should be able to Google his name and come up with his website.There is another guy I have used out at Orange for resizing and balancing/peening who is well known ,but his name escapes me at the moment. Anyone???