If only a half round file is available, what limitation might a worker face?
Difficulty accessing sharp internal corners
A half round file has one flat face and one curved (convex) face, letting it work both flat and curved surfaces.
Because both of its faces are either flat or gently rounded, it cannot reach into a tight, sharp internal corner where two flat faces meet at a small angle.
Reaching such sharp internal corners needs a file with a keen edge or angle, like a triangular or knife-edge file.
So with only a half round file the worker faces difficulty accessing sharp internal corners, not an inability to file curves or flats, or excess material removal.
Hence, the answer is Difficulty accessing sharp internal corners.
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