Then extrude the resulting poly 36 units after which we'll bevel it using a Height of 1 unit and an Outline Amount of -0.5 units.
Once again we'll extrude the result, this time 12 units. And then we'll do another Bevel, with a Height of 0.5 and an Outline Amount of -0.5.
Go to Edge selection mode and select all edges that define the squares which go across the length of our dart. No diagonal or longitudinal edges should be selected. Double check you've made the correct selection before moving on. Chamfer the selected edges 0.025 units.
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