Marking and shaping the root end of wing panel - steps 13 & 14

13) Position the “4” degree side of the guide tool exactly where the end of the bottom spar is shown on the plan. Use a pen to mark an angled line on the top and bottom spars, the leading and trailing edges (PHOTOS 1 – 4). Note that the top spar will be slightly shorter than the bottom spar.
14) Unpin the wing panel from the building board. Using a sanding bar and/or razor saw cut back the spars, leading and trailing edges to the line you drew being careful to keep the edges at the proper angles (PHOTOS 5 – 8).