Cool Tool

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Need to shrink a bushing or bearing race when you’re miles from civilization?

If you’ve got a pressurized bottle of carbon dioxide (CO2) and a dry ice machine, you can make a block of -109 degree F dry ice in a few minutes.

Put that block of dry ice in a cooler with the piece of metal that needs to be shrunk and you’ll soon be moving on to the next phase of repairs. Small boxes with regulators that will form a block of dry ice when connected to a pressurized bottle of CO2 are available on eBay for as little as $500.

— Dan Anderson