Originally Posted by Dr Croubie
ps, besides SK Grimes, there's also This Guy: http://www.customphototools.com/
although, I emailed a few weeks ago and never got a response, maybe you'll have better luck.
I recently bought the brass 43mm x 0.75 to M39 Leica mount reverse adapter from This Guy. Ordered from his website, prompt delivery and a good quality adapter.