disclaimer: check your local laws to make sure they are not illegal where you live before making them, don't hit anyone with these and use common sense. I am not responsible for anything stupid you do with them.
What you need :
Wooden dowel rod 3/4 inches thick ,14 inches long
Drill & drill bit
2 crown bolts
Aviation snips (or something else that can cut chain)
Some type of saw
Step 1: saw & drill
First take your saw and cut the wooden dowel rod in half so you have two pieces that are about seven inches long. Then find a drill bit that is a little smaller then the crown bolts screw and drill a hole in the top center of each rod. Make the hole about 1 1/2 inches deep.