My fly house has a mix of 4" and 6" width counterweights in its inventory. I'd say at least 90% of the weight is 2" high, 4" wide counterweights, maybe half a dozen 1"x4" bricks, and the remainder is 1"x6" bricks. All the pipe weight is 4" wide bricks. Setting aside the question of where the 6" wide bricks came from in the first place, here's the question I have: Is there any reason not to mix 6" wide bricks into the system? By and large, I never use them for anything but doorstops and ballast on wagons, because it doesn't give me a good gut feeling to mix them in with the 4" bricks. Am I off base? Am I worrying about nothing?