A unique flip open blind cap has a springy hinge to hold it either fully open or fully closed. Under the cap is a ball attached to a lever. Press it laterally to use the internal lever.
![](https://vintagependoctor.com/wp-content/uploads/2020/03/eagle-toggle-patent-snip.jpg)
A unique flip open blind cap has a springy hinge to hold it either fully open or fully closed. Under the cap is a ball attached to a lever. Press it laterally to use the internal lever.