So now your graphite tips are dull. Borrow or buy an inexpensive diamond stone sharpener. Keep your pole tip wet (dip in water) and sharpen both narrow flat surfaces by rubbing until the tip is pointy again. This will take a bit of time if you have let them get dull - get a lawn chair and sit in the sun. At the end your hands will be quite dirty so have a rag or sink handy.
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