So Craig got me thinking- that must be the problem with my wiper!  I didn't
realize the spline was tapered.  I took Mark's idea and used a punch to make
the hole smaller rather than a spline.  In my experience hitting  a socket
with a hammer can ruin the socket.  Anyway, I did it and now everything fits
like new.
THANX guys
ed- the one with two wipers that work on a 91 DoKa