The main problem I encountered while trying to refit the glass, was that the thin frame seems to have the annoying habit to bend open while pushing the glass into the frame, which causes the glass not to be tightly clasped.

Initially, the solution for this problem seemed complicated; handbooks of VW showed a mechanism, which rather makes you give up hope than encourage you to get the job done.

However, I figured that I could pull the trick using readily available material. The tool exists of 3 layers of 12 mm thick plywood. The middle piece is shaped after the model of the vent window frame; it will hold the frame, preventing it from bending open when installing the glass. The cube is used to hold the edge of the glass. It will spread the pressure and will protect the glass from shattering when pressure is applied with the vice.

To start fitting the glass, fit the middle piece onto the floor plate. (I used two screws for easy disassembly). Put a cloth (or as in my case, my t-shirt) over the moulds; this will prevent you from damaging those nicely spray painted frames. Place the window frame in the middle piece as illustrated on the photos. Now install the rubber into the frame, using plenty of soap.

After the frame and rubber have been installed, place the last piece onto the assembly. Note that this top mould almost has the same shape as the middle mould. It is slightly smaller (ca 5 mm), which prevents the frame from moving up when applying pressure.

Now all preparations have been made, soap the edges of the glass excessively. Carefully push the glass between the rubber and the frame. Place the block to hold the edge of the glass and install the vice. Moderately increase pressure with the vice to slide the glass into the frame. When the glass slants, move the vice and block to the left or right to adjust accordingly.

Belief it or not; my first attempt was a direct strike home! Luckily the thorough preparation paid off after all! Now, before loosening the vice, tighten one more time from top till bottom. Check that the glass no longer moves in the frame.

Remove the vent window assembly from the model and rinse it thoroughly to remove the soap. Leave the assembly to dry for some hours. After it has dried entirely, cut away the redundant rubber. The piece behind the rain deflector is pretty hard to remove…

Notice that the piece of rubber between the door window frame and the vent window (the vertical one) is triangularly shaped and is not symmetrical. Check if it seals the vent window when you close it.

One last reminder is to pay attention to the right order of the rings on the lower pivot of the vent window. Check before you refit the rivet on the upper pivot, it will save you from trouble… ;-)

Finally, the ends of the frame have been filled with Bison PU-kit; leave it to dry and cut away the redundant material.