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Sorry to revive old thread. Anyone know why Wiha (as above) say recent rMBP base plate needs Pentalobe P4, but iFixit say Pentalobe P5? After researching quite thoroughly, I have just bought a Wiha P4 and Wiha P5, and find the P4 has a little bit of play in the screws of my rMBP, but the P5 is too big for nearly all my screws, but will actually fit one or two. Something is not right here. EDIT After actually doing the job I now feel the Wiha P4 is the right tool and the small amount of play in the fit was normal, with a bit of autosuggestion because of the P4 vs P5 issue. So still puzzled by the P4 (Wiha) vs P5 (iFixit). Sorry to revive old thread.
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Anyone know why Wiha (as above) say recent rMBP base plate needs Pentalobe P4, but iFixit say Pentalobe P5? After researching quite thoroughly, I have just bought a Wiha P4 and Wiha P5, and find the P4 has a little bit of play in the screws of my rMBP, but the P5 is too big for nearly all my screws, but will actually fit one or two. Something is not right here.
EDIT After actually doing the job I now feel the Wiha P4 is the right tool and the small amount of play in the fit was normal, with a bit of autosuggestion because of the P4 vs P5 issue. So still puzzled by the P4 (Wiha) vs P5 (iFixit). Click to expand.Yes, the Wiha P5 was too big, but it would just engage with a couple of the screws, but I felt it was not a proper fit. Most of the screws it would not engage in at all. Interesting variability implied, and also because when I did the job, I found one of the screws would not screw down flush under light torque.

I had to chop and change the screws in different positions to find a combination where all the screws would fit flush under light torque before final tightening. The rMBP was bought direct from Apple by me 13 months ago, and no-one has tampered with it. I have dismantled and reassembled many MBPs in the last twelve years and never had this problem. Yes, the Wiha P5 was too big, but it would just engage with a couple of the screws, but I felt it was not a proper fit. Most of the screws it would not engage in at all. Interesting variability implied, and also because when I did the job, I found one of the screws would not screw down flush under light torque.
I had to chop and change the screws in different positions to find a combination where all the screws would fit flush under light torque before final tightening. Korg triton extreme drivers for mac. The rMBP was bought direct from Apple by me 13 months ago, and no-one has tampered with it. I have dismantled and reassembled many MBPs in the last twelve years and never had this problem. Click to expand.I am 99% all mine were same length (late 2013 rMBP), but you have left me with a niggle of a doubt. If different lengths explained why one would not go flush initially then the difference in lengths is extremely small, like maybe a quarter of a mm, which is enough to not feel flush but a small difference to observe.