Is it possible to replace the wiper blade when the arm will only pull back a couple of inches? I have moved the blades from the parking position but arm on the passenger side pulls right back and replacement is easy, whilst the other one is of a different design and only allows slight movement away from the screen. Obviously I could remove the arm but, according to Haynes, this could require the use of a 'puller', which I don't have. So is there any little trick that I can employ and is it worth considering changing the arm? Eric