That one came in 2007, as Thornes was mounting a television on an apartment wall with an expanding bolt.
"I was using this expanding bolt and I thought, this would work well.
Designed to provide better fixation in osteoporotic hip fractures, the device is described as an "expanding bolt akin to a Chinese lantern with a central drive shaft." Its opposing threads compress an expandable section from both ends to expand the wings perpendicularly to the shaft, without spinning, pushing, or pulling the hip's femoral head.
One common bolt used in landscape applications is the expanding bolt
or molly bolts (Figure 28-2).
Using a hammer drill with a masonry bit, drill a hole the same width and depth as the expanding bolt. Connect a galvanized post anchor to the top of the expanding bolt.
Anchoring must be done using galvanized expanding bolts rather than lag screws.
You'll need to drill four holes in the wall (expanding bolts
supplied) and assembly takes a minute or two.