Originally Posted by big john

The last garage where I worked was very old and they updated some of the in-ground hoists to the above ground electric ones. To do that they must remove 2 4 foot squares of concrete and pour thicker, reinforced concrete to anchor the hoist. After the concrete cured they crew bored the holes to bolt down the hoist and wood shavings came up. Turns out the concrete guy filled in part of the job with wood blocks, which could have caused the hoist to fall over with a car on it.