Some bike shops maybe able to help other so it will be case of go and ask / ring round. The tool required it very expensive and in fact is usually only used for chasing threads out rather than cutting them to start off with. Are there any signs of old thread in the shell that have been stripped?
measure the internal diamiter of the shell to check what threading standar it will end up being. It should be I.S.O / british but best to make sure. Good luck.
Ok cheers, will look into it further today, still dubious about those threadless barckets though.