Lower Rotary Assembly v7

This is a lower rotary assembly for a toy helicopter.
This is the 7th revision and final version. The tolerances of the model are down to .006" in the model meaning that with a highly tuned printer there is no reason that this should not be a snug fit on the shaft. Added features:

- stronger joint between the shaft and blades.
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- tighter tolerances on all screw holes.
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- within the blade slot, mounting hole has bevelled guiding diamitor
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Current model tested in ABS on a Upr