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First lets get the top done as its the quickest and easiest.This is where you will use your 3 inch hole saw of if you dont you will have to trace you net pot and use your razor knife but cut 1/8 inside the outline so pots dont fall in. I like to use this spaceing for my setups.I hook the left side of the tube with the lid on at the top about 3 inches down the side and then pul my tape measure and mark a dot at 4 1/2 inches , 12 1/2 inches and 20 1/2 inches.I then hook my tape from the top of the lid above each of those marks and come down 3 1/2 inches then where each mark crosses is a center point for your net pot.Repeat this on the other side of the lid so you have a total of 6 marked centers in 2 parallel rows across.Then take your hole saw and center the tip on each mark and dril all the way through the lid ending up with this ...
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