10 Unusual Uses for Tennis Balls by wilgubeast
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Step 8: Sand Curves

tennisballssand.jpg
Under most circumstances, sanding is a necessary but unpleasant task. When you're sanding a curve that needs to stay curvy, try wrapping a tennis ball with sandpaper. It'll prevent the flat spots and unevenness that you might get if you only sanded by hand.

Pros can generally sand any shape without sanding down corners or otherwise permanently affecting the shape of their project. If you're failing to get a smoothly rounded shape, try a tennis ball.
 
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SIRJAMES09 says: Nov 24, 2011. 8:43 AM
to keep the sand paper from sliding around the T-ball, spray it LIGHTLY with spray adhesive(spray the backside of the sandpaper not the ball). that will keep the sandpaper on the ball so you can be on the ball also. :)
Massimo4 says: Sep 8, 2011. 3:39 PM
You left out my favorite When arrow tips break off in archery class, rather than throw away the arrow, attach a tennis ball to the tip and duct tape it securely.

Now you can number trees around the yard and play bow and arrow golf!
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