I warmed the outboard area of the upper strake shell with a heat gun and placed weight on it to increase the curvature to better match the wing. This worked better than expected. I inadvertently let the top strake move when measuring in place and ended up cutting too much material on the outboard side. I took the part I had cut from it with the air saw and glued it back in place with micro. Once cured, I reinforced it with 2-BID glass on the inside and grinded it to the correct size.
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