I used a complete Austin/Rover cable drive set up on mine with spindle adaptors from a series one Land Rover with stainless wiper arms and blades.
I re-drilled the spring mount to increase the spring tension and they work just fine,even in west Scotland.
A dab of Rain-X always helps too.
(P.S. We do get a lot of the wet stuff.)

1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.