I went on to make the little one way ball valve as per Jan Ridders plans. I`m a little confused here. I presumed that this engine did not need a one way valve since anything coming back down the fuel intake would slam the normal valve closed. However reading a post on the HMEM forum, a few people had mentioned that the Webster may need one! Considering I need a connection from the valve block, I thought I`d make one anyway. Needs a good polish but it turned out quite well.