Hi apologies in advance for this lame question I have got an old omega estate M reg , the rear window has got quite a curved shape and for the life of me I cant get the wipe to wipe the full curve of the glass I have tried bending the arm around a bit but still cant get it too wipe the length of the blade ?

I know this might sound a daft question too a lot of you that can probably build a whole omega nut and bolt but it sure frustrating the bits off me lol

has any one got an idea how to solve this little problem , cheers