I'm having trouble working out how to screw the 2 screws for the hinge into the top door channel.

Is there a secret knack?

I can't get a screwdriver at the right angle without taking the hinge pin out.

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it should be possible... i have just taken my windows out of a 65 and the screws for the ventilator window hinges were fully accessable.

The latest VW Treds shows the pin being removed, then replaced once the window is in place.

Maybe re-use the original brass pin, or pop rivet.

from the look of mine i think i will have to take apart the hinge anyway to get the new rubbers in.... the old ones were pretty u/s, so i ripped them apart.. might be why mine came apart pretty easy.