The process to avoid cracks was to first mark the holes carefully be shining a light from inside.
I then drilled with a tiny 1 mm drill. By doing this I was also able to adjust for smaller errors when then drilling with #40.
For the sides I first drilled with a really dull #40 and then when it was only the inside 1407 canopy skin to drill, I had to use a sharp #40 drill.
I think the next step is to final drill them to #27.... we shall see.
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