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I don't know the actual size? When I buy torx bit, I buy them in a set, several different sizes to chose from. I have seen safety torx bit, The screw or whatever has a rise in the middle. You have to use that type bit.
If your friends with the person at the autostore, they may let you borrow a bit off the shelf, so you can find one that will fit? They have let me do that in the past and the sales person was a stranger to me. I found the proper bit and I bought it.
I'm new to the site, I don't how to find this post again?
There should be a square slot for a 3/8" drive ratchet to fit in. that is where you grab the tensioner to pull it to the side for belt removal. The normal tool for this is a long flat bar with the square end so you can get enough leverage. If there is enough room a 1/2 drive breaker bar with a 1/2 to 3/8 adaptor will work.
I ran into a similar problem when working on the bolts that hold the 4 piston calipers together on my BMW 2002Tii, that the Torx was too small and rounding off the inside edges of the bolt head. Being unable to find a bit that was between the x5 and next size up x0 torx, I decided to consult an expert. After going to the service department of my local dealership and talking to some of the older and more knowledgeable guys, we determined that the easiest fix is to take a cheap torx bit and grind down the tip of it so the bit engages a little bit more, since the bit tapers towards the end this would give much more of a positive engagement. Worked great after 3 minutes on a belt sander.
Those bolts should be allen head bolts and NOT torx (star shaped). With a torx bit in that hole all u will do is mess up a torx bit and the flats for the allen wrenches to grab onto. Try using a 10 or 12 mm( cant remeber which it is) allen head wrench.