Whenever I need to drill a hole that's large I start with drilling a small hole, then use a larger drill to make a medium size hole, then use the right size drill for the whatever diameter hole is needed instead of trying to do it all at once. The job ends up going quicker, saves me from being frustrated and doing a lot of cursing.
Thanks Nayan, that is a good tip that would've made this job easier on the battery powered drill, but I only had one bit that was long enough to drill through a 4x4. If I had to install these gates on a regular basis I might get a smaller long bit to be able to split the load between the two.
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