Erroneously described as a 'spit and polish tune' by Dave Hall, the basic springer tune is about optimising the springer as it is without any mechanical modification. The idea is to bring it to its most efficient while remaining as the designers at the factory intended it to be. It will remedy most of the poor finishing that sometimes is observed in both cheap and some of the more expensive brands and will deal with the issue of lubrication which is almost always too much or too little 'out of the box'.
http://www.airgunbbs.com/showthread....ing-Gun-Tuning
There is no such thing as a 'spit and polish tune'. 'Spit and polish' - the use of saliva and a soft cloth for buffing to give a high lustre on leather - is the last step in polishing one's shoes or boots, and comes after cleaning, treating, waxing and brushing. It is a false analogy to use it as shorthand for the careful cleaning and finishing of moving parts and their correct lubrication in a spring rifle. A basic tune is much more like what a good mechanic will do when servicing a car, making sure everything is working efficiently.
The type of tune is really a 'basic tune' defined as such as not requiring any special parts or non-factory components, just finishing work and relubrication.