I posted a thread a while ago about using Butterfly mantles as double tie mantles by un-stitching the sewn end. What might not have been obvious, particularly for new lampies, is the different methods of tying mantles to the burner assembly. On the back of Peerless DT 140s, there is a diagram that shows the method they favour like this... This is a little different to how Tilley shows how their 164 X mantles, so I drew a diagram that attempts to show the two methods side by side. When I use Butterfly mantles as double ties by undoing the stitching a the bottom seam, I use the method on the right as these mantles are a bit larger. I'm sure others my have a different opinion, but I think the second technique gives a better shape when the mantle is 'inflated' for the first time and forms a greater surface area.