wiper arms stuck in the middle

I have a 1968 vw bug. when I turn on the wipers the arms dont seem to clean the whole windshield. When I turn them off they stay up about 4" from the bottom of the windshiel. Can anyone tell me if this is a common problem and if it can be fixed?
Thanks, Jeremey

To rule out any linkage problems you can remove the dash wiring cover (if it's still there) from under the hood & watch the motor & linkage to see if something is loose. Very often the cars have incorrect or just worn out wiper arms on them. By worn out I mean the clamp that attaches the arem to the shaft is loose & won't hold tightly. The original design in your car had a screw that you could find if you lifted the arm off the windshield & looked under at the base. If all is tight just release the arm from the shaft & reposition where you want it.