I've noticed that the outer edges of the triangles on my detail sander wear more quickly than the center area.

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I've noticed that the outer edges of the triangles on my detail sander wear more quickly than the center area. To get better "mileage" out of each triangle, I move the disc forward on the pad, trim off the worn areas, and proceed to use the fresh sandpaper. Moving the triangle forward twice will triple its life.
Bill Bartz, San Jose, Calif.