哦，不，另一個(gè)可定制的指輪旋鈕螺絲隨便什么：D

I know, there are already to of them. But I had some specific needs and I simply like to play with customizable opecad desig.
It would not be worth if it was not veatile so you will be able to design you according to your needs. I publish it anyway: having more choices never hurts and people may even find that it suits their needs better in some case, who knows ;)
By the way with one wing only, you can make wrenches!