Gobble Shakers can always have a fault as the same as other types of calls. If there is a problem with a call you should send it back with an attached note of the problem. The Refills for the Gobble shakers do break down as mouth Calls do. Light and heat are the two main enimies of these calls. Refills do pop out from the inside and can be changed. Phone and order from the company. Sound will not be 100% to the real bird, but will sound better from a distance. You can use them with a one hand opp.by shaking back and forth and drawing your hand down as you do it , or with a two hand opperation covering the end of the sound chamber as you end the gobble...B