I use my trusty old pendant drill for drilling holes pre piercing, it is one of the old types with a start button on the drill piece handle and I use a wax candle for drill lubrication.I also have one of the pendant drill with the slip joint on the flexshaft, complete with a quick release handle for holding burs and a hammer handpiece, this drill has the foot pedal speed regulator. I wouldn't like to drill 8000 holes with a bow drill:-)
James
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