The Sanwa Denshi JLF-SP-VI Violet Tension Spring adds "weight" to the Sanwa Denshi JLF and JLX joystick lever series. In a default JLF/JLX joystick lever, it needs 1N force to move and compress the spring. The half size of the violet spring allows the lever to start the initial movement with 1N force and ends in the final compression with 1.5N force. This spring aims to replicate dampening feeling of rubber grommets found in Koren-style joystick levers.