Technique for evenly attaching devices to a wall. If you have a photocopier available, you can also create an instant template by making a copy of the back of the item.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...e_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net..._technique.jpg
Previously:
https://www.homemadetools.net/forum/...193#post130496
https://www.homemadetools.net/forum/...122#post168703

