Troubleshooting

Read the instruction manual. These look straightforward but they can be finicky.

Plan out your design first, and look at the corners of the panels to make sure you have holes available in the right position.

Corners can be removed and rotated, but it's not a guarantee. Sometimes they just don't want to fit back in and you have to remove two corners to adjust either of them, and sometimes the threads get crossed because of the metal-into-ceramic connection. 

Be SO CAREFUL not to cross thread.