thanx guys i ended up buying already made rings from a local shop $2 each and they accually had carpeting to w000t. it was GAIN audio for any local people
they have circle guides for jigsaw. I bought one from sears. . it fits any jigsaw. Don't buy from selectproducts.. they're a rip off.. but they do have it all though but high in markup on prices.
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I dont have an alero no more...