This is a handy fishing tool that no kayaker should be without. When you need to tame them Crazy Halibut yak-side this baby gets results and floats.
Guaranteed to put a lump on your head.
1" piece of schedule 40 PVC pre cut into 24" lengths. $1.25 @ Home Depot
2 end caps, .51 ea. and some RedHot Glue around $5 bucks (maybe a buddy already has some you can use). $2.36 and you're in business.
I cut mine down to 18" for optimum performance.
Crack some skulls.