thanks for your response unfortunately the threads are completely rotten just been given some info on an E9 fb site where the guy has done it, really helpful gonna give it a go!not sure you can replace it, you could run a die down the bolt and clean up the threads. if the bolt is turning inside the rubber, some people have successfully added glue to make it useful. they are still available from W+N for 36 euro (w/o VAT)