Rob from the blog Handy Man, Crafty Woman recently posted a very thorough review of the Hang & Level picture hanging tool.
“That was fun, and it only took about three minutes. No struggling, no “Does this look straight?”, etc. We will be using this when I get around to hanging more photos in our stairway.”
Have a look at HandyMan Rob’s picture hanging project at the link below. He also tried Stoppy around the house and ended up using one to keep a heavy window open – it worked like a charm!