Professional builders use a plumb bob to make sure their walls are vertical. Here's how. Measure two inches away from the top of your wall, set a nail, and hang the plumb bob. Let gravity draw the ...

Then use a plumb bob or a washer tied to a string to mark where you want to drill your holes. To do this, dangle your plumb bob from the ceiling above your rack, ...

For this purpose, you'd be better off using a real plumb bob, especially since the back of the iPhone isn't perfectly flat, which will throw off your results. Bottom Line: Looks great, but is ...