http://vanheldengamecalls.weebly.com/diy-projects--blog/suction-yelperI made these years ago for a hands on project for kids and adults at local shows and clubs. Follow the link for pictures on my vanhelden.weebly.com DIY page.
Basic Instructions:
Take a 20 or 12ga. Shell and pop out the primer, take a 4" long drinking straw and insert into the hole, then take 3" of a small mixing straw and insert into the drinking straw. Done!
You can change up the straw lengths to change the tone. It's a fun project to use at shows, clubs, scouts, 4H, etc....
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