Chris - This upgraded m/c has been used by a few people...
http://www.ebay.co.uk/itm/MASTER-CYL...item5add9eeea9
I've actually got a brand new one in a box "somewhere" that I will not need.
As by using the Spitfire bulkhead on my Cordite I can keep the original "tandem" m/c.
PM me if you are interested and no hard feelings if you want to use something else.
Cheers, Paul.