[header] How to make a clicker for dog training [title] Find a small aluminum jar lid. [step] The lid on a jar of baby food or the lid to a small mason jar will work. You want a lid that's around 2-3 inches (5-7.6 cm) in diameter. 
[title] Place the jar lid face down on a flat surface. [step] The underside of the jar lid should be facing up.