Will,
If Neil McKillop does it then I am sure it will be a cracking job. He has threaded two Sauers for me in the past, including re-fitting the front open sight behind the new thread. He is based about 10 mins from Basinstoke on the Reading road. He posts on the AGBBS under the nick Dasherman.
P.s. you going to the steels with Caterham in July?
Kyle