Boring Hole for Antenna

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ncburch22

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Putting GMRS setup together. Ordered the Comet RS730 bracket. This is designed for CB use so the diameter is 1/2”. Several folks have bored the diameter out to 3/4”. I did this and found the threading impedes the wiring portion from sliding inside of the hole. My question is..

A) Should I go a size up on drill bit and bore further

B) Get a step bit ^^ or

C)
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Cut a small slot in metal to allow portion of wiring to slide through and tighten antenna down
 

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