My method is to use a small double cut file to establish three bevels and then hand sand with 180 followed by 220. I do this just before the final 220 sanding leading to the finish process and it eats up less than 5 minutes. Aside from comfort, the broken edge is important first because surface tension will hold wet finish away from a sharp edge, and second because a sharp edge is much more vulnerable to wear and tear damage.
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