Mark, I went thru this recently on my 87 GL.  Here's what I found:  The
bushing in the wiper arm is apparently made soft enough to "groove" into the
spindle when the nut is tightened.  That is, grooves are formed in the
bushing the first time you tighten it down.  If you did not locate it
properly as to angle, then you can't simply rotate it on the spindle without
danger of stripping smooth the grooves you've made inside the bushing - you
can relocate it along the same grooves by pulling it all the way or nearly
all the way off the spindle, but you will probably be out of adjustment -
for there will be only 8 or 10 grooves, meaning a 35-45 degree shift in
position with only a one-groove change.  I finally gave up and bought a new
wiper arm - and very carefully lined it up on the windshield before I
tightened it for the first time - a bit tricky because of the
spring-loading.   But I paid under $20 for a new one, I think - Bus Depot,
although others may have it too.

Jim Creech
87 Westy GL, 2.1

> I'm having a problem with my windshield wipers not wanting to stay tight
on
> the shaft.
> Mark McCulley