According to one embodiment, the disclosure provides a system for algal cell lysis. The ratchet member 12 has respective ratchet surfaces 24, 26 on opposite faces thereof, A screw-threaded bore 22 is formed through the ratchet member 12. A ring is secured to the body portion of the yoke, such as by press fitting, and a balance weight is secured to the ring, such as by welding. A hinge couples the upper arm to the base section such that the upper arm is pivotable relative to the base section. Also, preferably there are at least two categories of system users including a first user category having full access privileges and a second user category having less than full access privileges but having access privileges to create and edit at least one station playlist.