Just when you thought you couldn't add any more custom tuning to your JLF... It's time for the Paradise JLF Actuators.  

This actuator adds 0.5mm to the diameter of the standard JLF actuator.  This shortens throws and allows for easier diagonals. Designed to take the stock spring or custom Paradise springs, aluminum actuators are a great way to fine tune that stick perfectly.

Support forums, actuators explained.