Racer's Choice in Seven Hills. Friendly blokes and will do just about anything.
There's another little old dude that runs a machine shop on Station street in seven hills. It's just off abbot road, and he's in that first complex on your left as you enter station street.
MRC in Castle Hill, just on carrington ave. The bloke that runs it is called Mark and he's a champion. He's usually happy to do most simple stuff, but he knows a LOT of people. Even if it's a job that he doesn't want to do, he can point you somewhere local and cheap if you ask him.