Step 2: Attach weight
I made sure that when I taped the weights to the flap, there were no loose ends to get caught up in the blade. (I'm lazy, but not so lazy that I want to see what happens when cast iron meets whirling steel!) I also checked to see if the weights stretched the flap out, making it able to get caught in the blades. In both cases, I was safe. In my next revision, the roller I build will attach to the mower, and roll a few inches behind the flap. Once I was taped up and safe, I got to mowing! The weight will now bend your grass in the direction you mow, giving it that professional "I'm so important that I have to hire a landscaping crew because my time is far to precious to work on the lawn" look. Have fun, and let me know if you come up with some cool designs. I read somewhere that one guy mows it in a diamond pattern, but changes the length for the crosscuts, giving him a 3-d look to his lawn. If anyone does this, please send me some photos!