After all the many valuable tips, I now take the easiest and cheapest way. I try the recommendation of the last post. With this I don't break anything and I don't destroy my airways. If it does not stick enough I can always try something else. So I just learned that Unibond repair extreme is the UK brand name of Pattex repair extreme which is from Henkel in Düsseldorf and therefore I save 11€ of shipping costs of a 6€ product when ordering Unibond instead of Pattex. I will let you know how it works. At least it is not witchcraft and no rocket science.
