Drilled the header at the top of the wall and the cross bar between the studs with a 4 foot installers drill bit. A bit of trouble pulling the wire as the hole is a bit small. When drilling the header an auger bit in a heavy drill works best. The installers bit tends to go to the corner if the cross bar is at a 45 degree angle, this will reduce the effective diameter and make it harder to get the cable through. Also any loose materiel in the wall may plug the hole.
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