Just an update on the scarifier. I have phoned INGS in western australia and spoke with Graeme who was most helpful. He said i need a roller bearing that pushes the belt outward to tension it. He hasn't a photo of one on hand with the guard off to show me but said it was a fairly simple setup. Due to the vertimowing season being finished he doesn't have any machines on hand. Most of the hire places such as Kennards have them and usually scrap them. I mentioned Bluebird to him and he said there was no comparsion as the Bluebird couldn't handle the ground as well as INGS machine.he requested i send some photos over to him and he will then be able to give me some better advice. It looks promising. He also said that they are working on a website.