I guess we didn't really need to think too hard about replacing the seal or not - it looked truly dire and was leaking in loads.

It came out without a fight - just cut one of the glass holding lips off with a knife and the glass pushes easily out from the inside.

I guess this goes under the heading of 'Clean the aperture'

There was a nasty crack looking thing on these corners - we decided to investigate

A little sanding revealed their true colours - all eight of them. Not glass cracks at all but cracks in the licourice allsorts school of painting paint job.

Roll on the new seal - literally - we played with easing, pushing, coercing but rolling was best. Bend it back and roll it on as in the picture

Cutting to length was a time consuming exercise - with lots of test runs and the like. Eventually we marked the seal right round, with a permanent marker, stretched the seal a little and cut it with a Swiss army knife about 5mm long to make it tight.

Sadly it was not quite square but a slow application of the angle grinder (praise the angle grinder) and it was just right.

The join looks pretty darn good - and even better with the glass in.

Fitting the screen is a bit of an art and lots of wooden half pegs gallantly gave their lives.

A good bit of advice from the Yahoogroups list was make sure it is central before you fit as it is difficult to centre up later. We marked it central with a permanent marker including the seal and then fitted it bottom half first, then bend the top back a little then when the lips are all mostly in place - push down and back quite hard and it all pops in.

We struggled for quite a while with the trim but then a posting to the list about some to fit these sprung to mind.

One quick mutilation of a coat hanger later and the trim was done in about two minutes. You can also buy a tool for the job from the classic car tool suppliers.

Just in case it's not obvious in the last picture.

And here is what made it all so easy.