I have put together some written instructions for the installation of rear hatch glass rubber with chrome insert. The whole process took approx 3.5 hours. It will be easiest if this is done on a table so you don't have to bend down whilst working on the hatch.
Make sure that the rim of the hatch, the glass and the rubber is clean. Mine had some old masking tape along the rim the whole way around.
For the string we used some leftover curtain rope roughly 5mm thick (see example image below). You have to work this inside the inner groove of the rubber (the groove that will fit over the body work) . You can use a fly screen plastic spline tool to assist with getting into the groove without damaging the rubber. Make sure that you have excess rope overlapping roughly 300mm.
next step is to fit the rubber around the glass
Once the rubber is on the glass you can carefully install the chrome inserts. Try getting the longer sections in first, then move to the smaller pieces. Once within the rubber they should fit pretty snugly. If they seem a bit loose hold in place with some masking tape.
Now place the Glass (with rubber and chrome insert) into the hatch. It should work in pretty easily. At this point tape the glass onto the hatch from the outside as you will need to flip the hatch over to work on the inside. It is best to get some help with this (make sure the glass does not fall out, this almost happened to mine)
With the hatch now turned over, you should see the excess rope/string hanging out. Now the theory of the string is that as you pull the string out, it will pull the rubber over the rim of the hatch. You have to be quite patient during this step as you don't want the the rope to cut the rubber. In practice you will need some assistance. To assist with this step we used (Ezy Glide Dry Lubricant Aerosol). if you don't have this handy, try looking in your bedside table and use some of your silicone based lube that's sitting in your drawer. If you cant find that look inside your medicine cabinet for some vaseline (would probably be a bit messy and would require more cleanup...but that's nothing new when using such products )
Now spray the rubber and the rim of the hatch with the Ezy Gllide and start slowly pulling out one end of the string. Make sure there is tension in the string when pulling and don't yank it as this will increase the chance of damaging the rubber. When pulling the string, try pulling at a 45 degree angle. We found that this worked best (see image below). Repeat this until all of the string is out.
I hope this helps!