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Production lines in the 30s (XX century), especially in the growing automobile industry, did have electric screwdrivers, but very few of those had the option of setting up the tightening torque. I’ll explain implications of this in the next paragraph.
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This problem was overcome by “American Screw Company of Providence”, Rhode Island, and after that Phillips became widely used.
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Those who wish to know how I chose this screwdriver can read the next chapters, but for those who just wish to know which screwdriver has worked very well for me, on both the American Phillips, and on Japanese (bicycle and motorcycle) cross headed screws, this is it (providing Amazon affiliate links for screwdriver pictures and price-comparison): In other words: how can I tell, before trying (and buying), if a screwdriver will work properly with bicycle, motorcycle and other cross head screws? The goal of this article (and my research for it) was to help myself find a screwdriver that fits well and doesn’t cam-out.
#TECH TOOL PRO 9 ISO HOW TO#
In this post I’ll explain how to find a cross-head (Phillips) screwdriver that doesn’t slip out when trying to unscrew a tight screw.