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Window crank knob question

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Hi Guys,
I just bought some knobs for the window crank handle. There is a bent springy washer in each package, can't see why/which side this would go on. Also the post gets pressed into the knob, could not do it by hand and I didn't want to use pliers on it. Do you use a vise to press the post into the knob? It looks like it would be hard to get apart again so i want to do this right the first time without damaging the knob in the process.

71 Coupe, red with vinyl top, 351-C, headers, 600 carb, mid range cam