I took a razor blade and cleaned out the splines of the shaft. As you guys
had suggested, it was just filled with soft metal and the splines are pretty
much okay.
I took a die and ran it over the threads, it made a big difference.
Apparently the thread is M6x0.75 (or at least it is now....).
The nut that I took off was particularly screwy, had almost no threads at
all in it. So I have sourced a new M6x0.75 nut and went to install. As I
tightened it down, It gave the distinct feel of stripping where the tension
built and then released. I since took it off again and rechased the threads
and have the same problem. The threads will hold a nut, just not with much
tension. As it stands it has enough tension to work, but clearly not tightly
as I can move the wiper arm with relative ease once it's tightened down. It
will work for now, but what can I do to get this nut tight?

Should I try a stack of washers to use a different section of thread to hold
the tension? (Stack of washers right under the nut).

I put aluminum foil on the splines as well, hoping to hold things in place.

-Craig

On Mon, Sep 19, 2011 at 2:25 PM, craig cowan <phishman068@gmail.com> wrote:

> On my project syncro,
> I found while driving the other day that the drivers side front windshield
> wiper was slipping on the shaft but not to badly. Today I investigated. I
> took the nut and lock washer off to find that there are no splines left on
> the shaft. Bummer. I figured I could just tighten up the nut and be good to
> go for a while at least right?
> Well in tightening the nut, I found the threads to be stripped..... it
> won't tighten at all.
>
> As it stands I no longer have a drivers side windshield wiper. I presume
> this job requires removal of the dash right?
> I was hoping not to have to do that until winter. Can it be done without
> dash removal?
> How bad of an idea is it to JB weld the thing on there..... for now?
>
>
> -Craig
>
>