Henry Ford was also very frugal and would do anything to save a penny.(read his bio) That being said,here is a excerpt from Wiki.
A split washer or a spring lock washer is a ring split at one point and bent into a helical shape. This causes the washer to exert a spring force between the fastener's head and the substrate. Applicable standards are ASME B18.21.1, DIN 127B, and United States Military Standard NASM 35338 (formerly MS 35338 and AN-935).
The use and effectiveness of spring lock washers has been in debate of late, with some publications advising against their use. Sources in reference are IS:3063, and NASA Fastener Design Manual.
did not know about the debate,have always used them and except for extreme vibration situations where i would use a nylock nut I will continue using lock washers. Bill
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