Staypu Shock Cord Clip Help

[DDD]

Anyone have the:

[h=1]Stayput™ Shock Cord Clip[/h]
They hold a canvas top down.
To install, the back screws into the base.

But can't seem to unscrew them to remove/replace.

Is there a trick that I am missing?

Happy New Year to All!

 

[DDD]

Never mind... I figured it out.
They don't screw off- they pry off.