What screwdriver have people used to access the memory bay on the new i7 iMacs. The handbook says a Phillips #2, however in the UK a "No 2" looks to be too large. I've tried every one in the house and nothing seems to work, the ones that seem to fit don't bite. Even bought a "No 2" from the DIY shop and it doesn't work!! Getting peeved how a 10sec job is now in its second day. Please help, I want 8Gb.