Torx head screws are getting more popular. They are a 6 sided star shaped indention in the screw head. Torx bits come in a variety of sizes. I am not certain that your coach uses them but I have hundreds of them on my coach. Most of mine are T20's. I have a reasonably full set of Torx bits with driver attachments from T8 to T48 and a few larger torx sockets for my 1/2" rachet.
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