I had to drill a 24mm hole though 400mm of rendered brick wall today.
Access was extremely tight and in a very awkward place. With a SDS on
hammer I started off with a short drill which went in fairly easily.
Changed to the longer drill and continued - this time the drill wasn't
moving through the wall - I thought it's hit something hard and exerted
a bit more force but the drill was still having problems.

Around a minute later it dawned on me that I'd accidentally switched the
drill to reverse. It's Dewalt and the forward/reverse is an easily
moveable tab incorporated into the trigger.

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