Hallman Replacement Spring LIGHT for Pro RX MBC

This is a light replacement spring only for a Hallman Boost Controller Pro RX.    This is the spring that the Pro RX model comes with pre-installed.  

If you have a functioning Pro RX Hallman MBC, you do not need this.  This is a replacement if for some reason you opened up your MBC and the spring launched across the garage and you can not find it.