Washers normally acts as a bigger head for the screw. When the washer is in place, the pressure of the screw that’s holding onto the material it’s drilled into is dissipated over the area of the washer and it makes for a more tighter bond. Imagine a brad nail, nailed into a baseboard vs a brad nail with a fender washer nailed into a baseboard. The one with the fender washer will support the baseboard better.
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