The FS 520 from Husqvarna features the patent-pending IntelliSeal bladeshaft system that allows for a minimum of 250 maintenance-free hours and eliminates daily greasing of bearings. The engine and bladeshaft-mounting system are other patent-pending features of the FS 520. It reduces overall vibration of the saw that produces better overall cutting performance, the maker says. It also significantly reduces vibration at the operator handles. The handlebar system easily adjusts to the operator’s preference and the handles can be folded for transportation and storage.