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Even with a center punch to mark the starting point for the drill bit, it's still hard to drill a straight hole through a round pipe. Eastiest way is if you have access to a drill press. This allows you to clamp the pipe down and the drill is mounted permananetly to a base that does not move. You tlower the drill bit by turning a wheel on the side. There is no worry about having to hold the drill straight with this method.
Some places like Home Depot or Lowe's will often drill a few holes free of charge of you buy the materiel (i.e. pipe in this case) from their store......
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