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Step 6: Sand the Lever Arm

Find the section of the back of the lever arm that comes in contact with the rubber band and sand the corners and back face to make them nice and round and smooth. Just to be safe, you should sand way more area what will actually come in contact with the rubber band. If you find yourself unable to stop stroking the silky smooth wood, you've done your job correctly. 

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If I scale the parts I think I could 3D print
Looks like perfect size on our board room conference table. ;-)
it looks so cool I am going to menards to get all the supplies

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More by madaro:30 Minute Desk Catapult (I made it at TechShop) 
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