Baseball glove steamer.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...r_fullsize.jpg
Previously:
Baseball hat steamer stretcher - GIF
Baseball testing machine - photo
Physics of baseball/bat collision - GIF
Baseball foul line painting tool - GIF
Hitting a water-filled balloon with a baseball bat - GIF
How a baseball is made - GIF
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