It will have swollen with heat and age, a new door is your best option, a decent quality machine unlike the current Indesit dross masquerading as Hotpoint, well worth sorting out properly TBH.
The Bosch part number is 166621, even direct from Bosch its half the Indesit/Hotpoint price, you may even get it cheaper from email@example.com
If I actually had a complete dispenser drawer in front of me I may have been able to give you some pointers but although I have done many of these over the years it is something I do only once or twice a year at most, when you have the spring in your hand it is just a matter of experimenting to get it into the correct position, its certainly not something I could do 'with my eyes closed' hence the difficulty in trying to describe the way it fits.
This is about the best I can do as far as an image goes, and there is no certainty that the spring is shown in the correct orientation.
That which can be asserted without evidence, can be dismissed without evidence.