Up here in Canada (not necessarily for automotive applications though) the Robertson square-head is the preferred type. Years ago when I had motorbikes, I noticed that a lot of the engine cases and elsewhere on the bikes the manufacturers used Phillips heads on their machine screws. All I know is this, most previous repair efforts with the Phillips heads resulted in damaged screw heads, Phillips (athough better than slot-headed screws for this issue) can cause a lot of bad language when trying to remove them, especially if someone else has done a previous removal. My neighbor was an aircraft sheet metal repair tech and I asked him once about why bikes (at least back then) used Phillips instead of say Robertson or maybe recessed hex head fasteners. He told me that aircraft still continue to use Phillips because they are stronger in relation to the amount of metal in the screw head. He said that Robertson and Hex are relatively weak because of the amount of metal that is removed to enable a better grip that you get with those other kinds. Phillips apparently are relatively easy to deal with and have a high level of strength because of their design. Just passing along what I was told, not sure if it is accurate or not. Next time you have a wing seat, look out and see the screws that are visible, they'll be Phillips.
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Today's Featured Article - Talk of the Town: Winterizing Engines - To Drain or Not to Drain? - by Russ Berry. What is this strange attraction I have to equipment and machinery? How did I get this way? I came from the suburbs and own a small horse farm in rural Loudoun County, Virginia. You can call me a "weekend farmer." The local farmers do. Does it bother me? No. I am just happy to have their friendship. At least the word "farmer" is in my title. But what is the attraction? How can I explain the sensation and exhilaration I feel when I turn the key and hear the engine come to life (most
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