1. Ah,,never thought of that, thanks! So, when is it advised to use a plastic washer over a metal one? In these types of situation? What are the main differences between both? I’m thinking that the plastic washer could snap if too much force is applied?

      1. In this application it is more of a shim to keep the arms from rubbing. And it spaces them equally apart.
        Mostly metal washers are designed to prevent metal nuts from sinking into a surface or binding on it.while you can use them for shims and spacers they do scratch the finish and wear surfaces they are put against.

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