This looks like what we need for those cam chains/drive chains. http://www.ebay.com.au/itm/11140218...&sd=251154859795&ssPageName=ADME:L:OU:AU:3160
The first looks the goods. I bought a seal / bearing driver and bearing puller off Ebay that I think is manufactured by the same mob. Really happy with it for the money.
I need a better one than I have, or at least a replacement spring. Bought a box of assorted springs from Bunnings on the weekend, going to try a few and see how well they work!