In my case a Y1 Tri-point driver loosened the silvery screws of 5 mm length.
Tri-Wing? I think it’s called Tri-point. Try-Wing is similar, but will most probably damage screws and screwdriver-blade.
i got a used book and opened it to exchange the hd to a bigger one. i found the airport/bluetooth cards connective socket dislocated and the speaker cables' socket as well. now i've led the free end of the speaker cable together with its connector through the opening of the kensington lock outside the case (no easy task but it went through) to fix a jack which goes into the headphones plug.
the airport/bluetooth cards connective socket is veeery delicate. i encountered one, when opening the book, which had been unintentionally dislocated by the previous owner. and no human is able to resolder what has been soldered by a machine robot. i have to use one or two usb sticks instead from now on, what a pity.