Thanks PatternFlyer, that sounds like good advice, I'll be printing it off and once I've got the new head, got the worspace cleared, and a cool Guinness poured, the operationd will commence !

It'll probably be a couple of weeks before I have the head because the UK were out of stock and Central Hobbies are sending one on - but I'll put up a post to let you know how it works out.

Vim, I'll check with Central as to whether the head comes with valves - at $115.50 you'd like to think it does !