Thanks for the welcome guys. The bike is 1954 swing arm model,an early one with frame & engine numbers under 1,000. I was lucky to get it from the original owner, people laughed at me back then for paying good money for an old bike but I was happy, still am! The bike was sold new in Lower Hutt, the first owner was a tool maker so it has been well looked after. Seems to have about 110 K miles on it, has had the crank ground once but it is still fine, good for another 100 I reckon. I need to replace the cam followers, any suggestions for a good supplier.