Welcome to the forums Tom.
This website can help you identify the part number http://m-and-d.com/ryobi_tools.html
I'm not sure about where to buy the part in Australia. You could try contacting Ryobi through their website to see if they can steer you in the right direction or possibly send you the part http://www.ryobitools.com
Good luck,
Michael
This website can help you identify the part number http://m-and-d.com/ryobi_tools.html
I'm not sure about where to buy the part in Australia. You could try contacting Ryobi through their website to see if they can steer you in the right direction or possibly send you the part http://www.ryobitools.com
Good luck,
Michael