BMW e46 325ci retracting cover actuator arm

If you own a vintage BMW, you know that some parts are impossible to find. 

This is the often broken or more likely, missing arm that attaches to the convertible roof structure, the b-pillar, and pulls a cover closed when the roof is in the down position.

The spring is held in place by a washer and glue, but I found that a push-on retainer nut did the trick. You can get these at a real hardware store.  I included left and right side, with friction fit pins.