I have a patio table with an umbrella hole in the middle. It is exactly 1" smaller in diameter than my patio heater support pole. The table is aluminum. I'd like to widen the whole. One friend recommends using a jigsaw. I'm not a big fan of this idea because I'm a klutz. I was thinking it would be better for me to use a rotary rasp followed by rotary grinding. The above mentioned friend believes this will not work because the drill will be too slow. Advice?