I drilled the bar about 3 inches from the end and again where the double groove starts near the brake lever. If you stand on the pedals while you yank on the bars to accelerate or climb hills or if you do anything else where you don't want to have a drill hole weakened bar, forget that you read this. And if drill your bars and if your bars break and you get hurt, don't sue me.
I have done this on both of my touring bikes, one bike needs a tandem length cable, the other just barely does not.