If you have a power drill, you can make a quick barrel lap with a rod and sandpaper strips. Split the rod on one end, slide in the sandpaper, roughly at the middle, and wind it counter clockwise. (in case you haven't figured it out, he sandpaper has to be inserted so it's sandy side out when you wind it)
Once you've set it up, insert in into the tube, power up, and move it along the.
WARNING- do not power up without the end being in the tube, and likewise, don't withdraw in while it's spinning.
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