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as jigman says,,start with the shorter bit then switch over to a longer one. the first drill bit will go in about 2" or so..[do both ends with the shorter bit] then switch over to the longer bit, that bit will follow the same path that the smaller one made,,,,here again don't try to drill all the way through with the longer one,,drill from both ends to meet somewhere in the middle...much easyer this way when making plugs that are 7-10" long
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