Dalbuie- Have you opened up the motor? There isn't much to it at all. As I remember it, there is a paddle, a filter and a couple of valves on top, but not much more. Mine was sluggish so I carefully opened it up and lubricated the paddle with vaseline after thoroughly cleaning the solidified gunk. It helped a lot.
I thought Wiperman charges a flat $99 rebuild + freight. You might consider checking DHL or a similar outfit to get the freight cost.
Do a google search. You'll find that there are some pages out there that discuss your question. Don't limit yourself to year and model- those vacuum wipers didn't change much over the years. The "technology" didn't leap.
Cool that you have a 'bolt up there in Scotland. It can't be easy keeping one running up in the highlands.
Bill
