Leaving it blank would be fine for some people but some others might find that a bit of a challenge to get right. I'd like to see a pilot hole template that physically clamps to the back of the head stock and lines up with the top edge to get the initial small holes in the right spot.
It doesn't really matter how you try to fool proof it, if its being done by factory workers then human error will always factor in unless more care is taken.
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