I would give Mermaid a ring, they are very helpful especially if your a member of the owners club (£15 a year) and have often provided useful advice even on a bank holiday.
Mike, any joy? I would have thought the guys at Mermaid would have put you right, they are very good as Pete said.
I have taken my injector pumps off a few times without major mishaps, so feel free to get in touch if your still having problems.
