There's a guy on Facebook Marketplace selling parts quite cheaply. I wouldn't normally go there but I was checking traffic for the run home and this popped up...

He's in Adelaide, and things like cutter sprockets (which I need) and cutter bearing housing (which I need) are $30 a piece. Looks like there's a fair selection and at $90 and $75 respectively, I'll be saving $100!

TC.