I had the problem on my '88. Tried everything. Ultimately had to replace
the locking mechanism. As it turned out, the original had a tendency to do
this because of wear over time. The replacement was an updated version
to fix the problem.. Once installed, I never again had problems with the
door popping open. As IRC, the lock came from Van Cafe. Others may have it.

On Wed, Nov 16, 2022 at 9:14 PM Alistair Bell <albell@shaw.ca> wrote:

> Hey Rick.
>
> Can be a number of things. Crud in the mech, attachment points shifted,
> rubber seal adrift….
>
> It’s hard to give to a silver bullet . One of those “ let’s have a look
> and try some things “ thing.
>
> Ab
>
> > On Nov 16, 2022, at 10:28 AM, Rick Cooper <rick@webleaf.ca> wrote:
> >
> > Over the past few weeks, the sliding door on my 1987 Westie does not
> want to close properly.  More specifically, the latch at the rear of the
> door does not want to lock onto the post mounted on the body.
> >
> > If I slam it hard and push inward at the rear of the door at the same
> time, I can usually get it to latch, but it is becoming increasingly
> difficult.  A couple of times the door has popped open while in transit,
> which is a bit unnerving.
> >
> > What is the solution to this?  Moving the post?
> >
> > Rick
>