I changed my battery yesterday but didn't have a cover with me so tried to change it at home, but the existing cover got stuck. I tried to use the plastic tool the combo comes with and managd to snap 2, so used a screwdriver and damaged the cover! then used a penny followed by a 5p and still it wouldn't shift. I then called the helpline for advise and was told to use frozen peas to cool the area and try again. No joy. They then said I would have to send it back, they would remove it (it is a common problem apparently!) and then when I replaced the cover in future I wasn't to tighten it too much. Hmmmm, you think?! :lol: anyway, I took it to my machine toolshop at work today (I am lucky, I work with lots of engineers!) and someone managed to tap the cover off without damaging the pump. The fact I was stood over him with a very worried expression on my face and that I'd just told him how much the pump was worth prob did the trick :wink: