Q: Can you tell me if any/all of the components for the iL Eurostick and SuzoHapp Super/Competition are interchangeable?
A: Jaleel was asked about this not too long ago and did this research. Suzo Happ was originally developed by Spain-based Industrias Lorenzo (IL), until Happ changed to a Chinese manufacturer.
The images in this knowledgebase are Happ with the black handle and IL joystick with the blue handle. Tests concluded that parts are interchangeable. The IL spring is stiffer than Happ.