cheers for the replies, they did them at machine mart, last option was to take it to m10 as it was on an aluminium head so wanted m8 helicoil to make it stronger,plus there is just enough room to fit a 10mm socket in for a m8, typical isn't it, was on the way to a job this morning had to get there for 8.15 and was going down the motorway and the No 2 diesel injector decided to come out stripping the threads and snapping the spill off pipes, had to wait for recovery wagon, just helicoiled it now and put it all back together, just need to get some spill off pipes now in the morning if i can find some cheers