Got my trackpad to work again in my 2009 MBP.

[btfc]

15” ? My memory and ifixit say the 13” MBP take a tri-lobe, but I have vague memories of needing a pentalobe for a 2009 or 2010 15”.

13” : https://www.ifixit.com/Guide/MacBook+Pro...ement/1332


Ah yes, the 15” is a pentalobe!

https://www.ifixit.com/Guide/MacBook+Pro...ement/1712


More:

https://en.m.wikipedia.org/wiki/Pentalob...rity_screw