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This is a very good guide to get you started. Many of the methods here are shown by myself and Lazerus2008! It's all good!
Some of the methods like the drilling and tapping of your gas cylinder is way too difficult for the average tweaker. I just weld the baby up and then start competing with a welded/unitized gas cylinder assy. This operation and pictures can be seen by the sticky(ies) posted by myself and Skullboy from many years ago... all found the top of this forum.