Hi rotachoc,
Well that's one of the last darker green SB45's from the Eagle Farm Rover Facility before they commissioned their new powder coating line which showcased their ugly new Kermit Green colour.
This is identified by the colour of the machine and the Silver and Black Ally ID plate.
I'm not quite sure if this is still the original power plant but could you please look for the series of numbers that are stamped into the edge of the air cowling near the carby / manifold area. This will give me a better idea.
Sadly I can't refer you on to any one in the NSW area but you'll find the best bet is to go to your local bowling club and ask the greens keeper there who they use.
The bend in a blade is a simple fix for someone with a bit of experience. Most engineers will source or make their own bed knives. Don't try and remove it yourself, let the engineer do that.
What's the main issue with the engine as by then the Briggs' were OK unless they became smoke machines.
The current sloper style Briggs units are OK but my choice will always be a Honda if choosing a replacement.
Cheers,
BB.