
I now have an ex-Mini wiper mechanism, courtesy of ebay!
Next question - if I lay out everything the way I want, the standard sweep of 110 degrees is going to be too much - I need about 90 degrees. I know
that the main gear that moves the rack back and forth can be changed to alter the throw, but I have absolutely no idea about where to find a
replacement, or what to ask for. The only supplier I could find was MiniSpares, and they only have the same standard Mini one as I've got already
(obviously!).
Any clues for a supplier, anyone?
And, before you ask - I'm an awkward beggar who gets an idea in his head and won't let it go! 
How about re-drilling the arm pivot hole in the gear at the opposite side but closer to the centre, the re-fit the pin and arm, and you have a shorter stroke.
SVc do em cause I bought one from them.
oh found the link for you .
http://www.s-v-c.co.uk/prod_wipers.html#assemb
Regards
Agriv8
Moss