I'm sure this idea had been around since as long as folks have been working under cars, but I figured there might be even one person out there who would benefit from this PSA. If you are going to work under a car that is supported by jack stands, please take the time to make a set of "Body Blocks". These here are made from alternating layers of 2x12 & 2x4 with the wood grain going different directions on each layer. They're held together with 3" lumber screws attaching each layer. I opted to to not glue them together in case I want to add or remove a layer. To use them; once you have the car lifted and on the jack stands, simply slide these under the car where they will provide support should the car fall off the stands. They're not intended to provide continuous support of the car and are not to be used in place of proper jack stands. They are only there to give you a chance to escape should the car fall or the stands fail. I recently gave my original set of body blocks to my son and I'm about to spend a lot of time under a British sports car and so I took a half hour this morning and made a new set. This PSA is especially poignant today. Earlier this week, a local father of 2, 42 years old, was killed while working on his car. The car fell off the stands and pinned him to the garage floor. The poor guy wasn't killed quickly, rather suffocated slowly under the weight of the car while his wife and kids were inside the house.