I'm not selling mine, but I got it done at an engineering place near me. If you don't know anywhere near you then ask around at a couple of garages where they get their machining done (like head skimming, etc. thats how I found the place that did my head and fly wheel) and that sort of place should be able to sort you out. as a guide for you, the work on the fly cost me something in region of £50, though I think it says the actual figure in my blog. If you don't fancy messing with your only fly wheel, I have a standard one with a decent ring gear for sale ;-)