At 08:52 PM 7/9/2008, Jack R. wrote:
>Question, when the spline on the wiper arms fail, and the arm can no longer
>be tightened... is the only fix to replace the arm???

Take a small sharp tool and clean all the metal out from between the
splines on the shaft.  Then bolt the arm back down firmly, cutting
new splines in the socket.  You've used up the arm when the bolt
bottoms out before the splines are cut.

--
David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage," '85 GL "Poor Relation"