Photo: David Carmack
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Place a 2-foot level on the windowsill, and note its high side. Then hold a 4-foot level against the window jamb on that side, and shift the sill left or right until the level shows the jamb is plumb. Tack a nail into the fin at the lower corner on the same side as the first nail.
Next, lay a 2-foot level on the sill, and adjust the free bottom corner up until the sill is leve. Tack the fin in this lower corner to the wall.
Next, lay a 2-foot level on the sill, and adjust the free bottom corner up until the sill is leve. Tack the fin in this lower corner to the wall.
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