Nissan OEM Retainer Spring (Throw Out Bearing) - SR20DET / VG30 / S13 KA This Throw Out Bearing Retaining Spring is essential in the proper operation of a transmission. It is located at the end of the clutch fork and around the throw out bearing. It helps movement and gear changes occur throughout the transmission. If yours is broken or youre simply performing a rebuild it is recommended to replace this small but useful accessory.