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You can sand and polish scored seatposts into a very presentable form. Check here: https://peugeotcoursepb12.wordpress....g/sr-seatpost/ Be sure to hone the seat tube, file back the points on the seat lug and file or sand back the upper edge of the seat lug to avoid re-scoring the post.

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Be sure to go just the minimum in the area which will be clamped in the seat tube to avoid undersizing the post.