Quote:
Originally Posted by island911
+1
I've driven a lot of both. The square drive seem to carry a tighter tolerance/fit between the drive and the screw (compared to the Torx). I found myself having to be much more careful with the torx.
To the OP: not such a good tip. A larger size Torx might work, as long as the jump in size is small, and the hammer is big. Else, you're tying to cold forge quite a bit.
Things to try first: Slotting the head, and using an old fashioned flat blade drive and an impact drive; if it's really far gone. If not, use the same size Torx drive and and the impact driver. (often the base of the socket has grabbable/contact surface)

|
a small impact driver like this is a quantum leap in effectiveness. I use these at work, and they have made their way to the garage as well.