I've got some pictures and a schematic at my web site ... you'll have to hunt for them. (
http://www.birch.net/~petek/cobra )
Since the fuse blew out the motor is probably safe. I'm guessing that when the motor stalled the current increased, blowing the fuse.
The roto-rooter wire thing doesn't spin, it goes in and out; pulled and pushed by a cam in the motor drive head. It's a funky arrangement, so typically English
(Hey, my grandmother was English, so it's ok for me to pick on the English.)
One thing you might try ... pull the wipers off of the wiper stalks. There is a tiny wire bale that holds the wipers onto the stalks (at least on my Cobra). With the wipers off put a new fuse in and check to see if the motor runs ok.
If the motor runs freely, turn everything off and put the wipers back onto the stalks ... the drive end of the stalks are knurled, you should be able to position the wipers so that they won't bind anymore. The wiper arms themselves (if they are like the ones on my Cobra) can be adjusted for length ... but the angle is adjusted by the positioning of the arm on the drive stalk.
If the fuse blows with the wiper arms off I'd guess that the drive head has a problem. Take the motor and drive head out of the car, remove the bolts that hold the cover plate onto the drive head and take a look, fix what ever is broke. I had to do this on my other project car (
http://www.birch.net/~petek/m6gt ).
I hope this helps,
petek