Stinger battery

I purchased a Stinger SP800 battery (with Pac200 isolator etc etc) and have come across a hurdle. The battery came with battery posts (round nuts) that have threads in them on the top. The pack came with 2 springs as well. First I went to home depot to get a bolt that would fit the thread in this post. Upon failure, I ordered a "battery post". A bolt looking device. Now I see that this bolt's thread is too small for the post but fits perfectly in the spring that came with the battery. I am not sure if this spring is to be fit in the post and if yes, how does one do it? Do I need a tool? Do I press the spring into the threads? It does not seem to screw-in. If the spring is not to be used, I am not able to find a place online that specifies the size of the thread for the nuts that come with the Stinger SP800. Even stinger's site does not specify. Any help is appreciated.

take the post into advance auto, autozone, napa, carquest, or O'reily  they can help you find the right bolt to fit the post. 4-15" RF T2

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