I need to replace the steering lock ignition switch unit on my ETZ251 as the switch is buggered. It is held under the top yoke with what appear to be hardened M8 security bolts with those tapered lugs which will only allow it to be tightened one way. The only way of getting em out seems to be to remove top yoke (a pain) and grind the heads off with an angle grinder and then turn the stems out. I tried drifting em round with knock stick and sharp chisel but it just bounces off. There is also little room to move. I really dont want to take yoke off, but if that's it, then that's it. Thanks JSM
