From the blog "The Motive Force Was Inside You All Along"
My second to last major project was Astra Militarum and I have a lot of infantry special weapons left over (as evidenced by the grenade launchers). Each flamer tank is good for two terminators. A modelling or jeweler's saw to get a clean cut in half, remove the little curving bit which would sit on the Guardsman's shoulder, clean mold lines, then slightly file down the end that will be facing the power fist side.
You'll notice there's a triangular side. This is perfect for fitting into