Use Connect dialog with the settings above to create additional geometry.
Now go into Vertex editing mode and select, in the Front View, the vertices highlighted in the image above.
Hit Align > X button to quickly set the same X coordinate for all vertices. Do the same with the vertices below. Now move all these vertices (on both rows) towards the shackle body and guess what? Your padlock is ready! We will create a key in a future tutorial and if we have the key a simple boolean will create our padlock's locking system.
We have just opened our tutorial directory! Feel free to submit tutorials hosted on your website or other online tutorials that you think are worth mentioning.