Sounds to me you've cross threaded the caps. Have a look inside and clean with a small brush.. or toothbrush. If it still wont work then it'l be cross threaded.
With the shock collars, try these on another set if you have some. Make sure these are also spotless.. and dirt will prevent good action. What is the 'certain point'?
Are the springs only rubbing in one area, or all of the body?
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