This is a fun and challenging way to test your accuracy and it's super simple to make!
Step 1: Making Our Project
For this project you'll need 3 tennis balls (Or however many you want) and 3 pieces of string about 4 feet in length.
Next, drill a hole into the top, and bottom of the tennis balls making sure that the holes are centered.
Step 2: Threading It Through
When that's done, go ahead and take your string, and thread it into the top hole, and then pull it out of the bottom hole and tie a knot at the end to keep it in place.
Step 3: Setting It Up
Your pretty much all finished, just tie up the tennis balls to anything that would make a suitable support. In my case I just hung them from a pole laying across 2 gun targets but anything will work. Have at it!