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Once all the fan mounting tab location holes were marked with a transfer punch and hammer, a spring-loaded center punch was used to deepen the impressions made by the transfer punch. This helps to guide drill bits when drilling pilot holes into any material.
Electric Fan Install - Cool Your Engine

 Once all the fan mounting tab location holes were marked with a transfer punch and hammer, a spring-loaded center punch was used to deepen the impressions made by the transfer punch. This helps to guide drill bits when drilling pilot holes into any material.  View Related Article

 

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