Hi guys.
Thanks for the responses.
I managed to open it. I just needed to add a bit more presure over a more extended period of time
I wanted to open it, as it has died on me and there is a lot of data on there I want to recover. After doing some research I was convinced that the hard drive has some mechanical issue (making clicking sounds, my laptop wont start up at all). And after watching a few youtube videos from repair professionals I learnt that the mechanical issue may be something as simple as moving the head, but in order to move the head I need to open up the drive. I figured I am not going to pay hundreds of pounds to a drive repair person when it might be something as simple as moving the head. Unfortunately after opening the drive I have learnt that the head is in fact in the right place, and the issue may be something else such as the PCB or Head needing to be replaced. I am still deciding whether to risk trying these things myself or to just give the drive to a recovery professional at this stage.