I found the answere to be very simple.
Fitting the door is a two stage process.
1 Hold the two fingers together against the strong spring with the styrup.
2 Enter the fingers into the body of the oven so the horizontal bar inside the oven rests in the c shaped groove at the end of the lower finger.
3 Lower the door until it is horizontal.
4 In this position the tension is taken off the styrup.
5 Fold the styrup away from the upper finger.
6 All done, close the door to prove it works.
Frank Philpot, December 2005