Hey Sean, not exactly obvious how it works from what I posted. It is small hot wire bow with a deep throat that is used in conjunction with the poster board template shown below. The wing core is sandwiched in the template; a starting hole is made with a soldering iron in each wheel well and hinge block opening; the wire of the bow is fed through the starting hole and hooked to power; the template guides the hot wire cut "through" the core leaving clean and precise surfaces. I like this process much better than cutting through the core with a knife, but it does take a little more effort. Hope that description helps.