So my (spare housing) must be stuck somehow. I have not managed to unscrew the cap yet with the tool I made. Need to secure the housing better and put a longer handle on the tool so I can apply more torque.

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked