This video shows you how to setup a tattoo machine to do lining and shading. Make sure the armature bar and front spring has about a 4mm gap. Once that is on, set it to about a 30-degree angle. Next with the contact spring you need to set the armature bar and the tool should be set to about 2mm. A good way to check this is with a dime. Now as long as the tattooing machine runs and sounds correctly you are all set to go. For shading, the throw on the armature bar should be 3-4mm--just a little less than the lining machine since you want the spring to do the work. Each step is illustrated and spoken through. Very easy to follow.
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