The adjustable pivot pin allows you to maintain correct truck geometry. You do need to check them regularly. If you need more action without adjusting the pivot pin, which you should do if you loosen the kingpin nut much, then just go to softer cushions. If that pin is to long the skates will be super sensitive, maybe uncontrollable and there will be odd stress on the kingpin. If the pin is loose in the cup, then your stroke may be sluggish and you will have pulling issues with single foot glides, you will like have issue going straight at speed too. There will also be some undue stresses on the kingpin. There are several resources on the Internet that show how to adjust it properly and how to know if you have.