Making tennis balls - GIF

Making tennis balls.

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Previously:

1880s skirt lifter for female tennis players - photo
Cutting table tennis rackets - GIF
Tennis ball pressurizer - photo
Tennis racquet stringing vise - photo

Showed this to my dog and he said throw the damn thing already...

Labor intensive.

Not nearly as automated as I would have thought.

I kept seeing pastries being cooked in muffin tins.