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What is the basic purpose of the three small holes (No. 60 drill) in the tipping of wood propeller blades?
| | A) To allow the moisture which may collect between the tipping and the wood to escape (vent the tipping). |
| | B) To provide a means for inserting balancing shot when necessary. |
| | C) To provide a means for periodically impregnating the blade with preservation materials. |
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