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Check Your Tire Treads
Here’s one car DIY trick that requires only a penny: To check your tire tread, hold a penny in the groove of your tire, Lincoln’s head facing down. If you can see all of Lincoln’s face, the tread depth is too low and it’s time to replace your tires.
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Another practical use for pennies is slightly staggering them in a circle and soldering them together to make a bracelet. Polish them up a little and you have a unique, inexpensive piece of jewlery. Really make it unique and use Indian Head pennies or the steel pennies used during WW2.