Spare pump arrived, and would have been an easy swap. BUT, for some strange reason, all three countersunk cap screws were very difficult to remove.
I had put copperslip on the threads too. Even borrowing an impact driver/drill failed to budge them. Finally got them out with a bit driver and rachet......the bit was imperial and I hammered in to each one ( oh the ham fisted horror, but NEEDED to get that bloody pump out!)
When I get home in a few days I will take the pump apart.
Meanwhile I've been droning away on the Nordwest all day at 120km/hr and all is well. Speedo cable inner snapped though.
Still got 200 km to go today