So I realized that its 3mm I need for m4 bolts. Silly mistake that was. So now need to find the tube in 3mm or get a helicoil to fit. More messing about with it. But apart from that. Just waiting on my hubs and links to make. Then I think the main build is done. Then just tidy it up and get some scale parts for it. And then probably start on a different car.