Took my spare switch off my spare lock assembly and verified the spring back is in the switch. You need a big #3 screwdriver to fit the slot. The spring back is about 1/8 " when turned all the way clockwise. You can check with an ohm meter on the pins for red and VI/WH wire. It should read zero ohms when turned all the way cw and infinity ohms when released. It it stays at zero ohms the switch is ng.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked