Windscreen wiper motor - help please

[TDTH1975]

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Hello all - lots of TVR's over the weekend, roofs off made for great viewing. I have an issue which will only get worse as the winter gets colder. When I try to use my windscreen wipers and wash the screen, the usual bzzzzzzzzzzzzz noise you get to draw the washer fluid no longer makes the noise - needless to say - I still have a very dirty windscreen. I am assuming that there is a little washer motor that engages when pulling the wiper arm towards you - is this easy to replace if you are far from a technically minded individual and if so, where can one get such a thing - or should I just take it to Dave Batty and call it job done.........

Any response would be good as I can't see much now.