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As a kid we always used tennis balls and taped two cans the balls came in together. Would just cut out the bottom of one can and used what was at the time called 100MPH tape (now referred to as duct/k tape). Zippo lighter fluid was our choice. If you soaked the tennis ball in the fluid first it looked really cool at night.

I wonder why tennis balls now come in plastic container versus the metal cans of old?