Tools and instructions not fit - adapter itself top

The installation, however, has not as simple with my Macbook Pro Model 8.3 as I had thought.
- The supplied phillips screwdriver did not fit one hundred percent to the installed screws, so that some of the Phillips threatened already to get broken when unscrewing. I therefore had to go on with my own fine screwdriver set turner.
- The printed manual and the illustrated instructions on the home page did not fit in all the steps to my Macbook Pro model. At one point, the part shown was not present to myself and I was first puzzled, as the existing part was expanding. Only with the help of instructions on other sites, I managed to continue expanding the hard disk.