I bought a tool from Padocks to change the drop arm ball joint for a few quid, makes the job dead easy.So i've gone with sticking a 50mm M6 (over the original 40mm M8) strait through and sticking a nut and washer on the other end. Spoke to the MOT guy and he said as long as it's not going anywhere it'll be fine. On to the drop arm ball joint change now, wish me luck.