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 - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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