Ping pong training machine.
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Previously:
https://www.homemadetools.net/forum/...770#post118872
https://www.homemadetools.net/forum/...550#post155167
https://www.homemadetools.net/forum/...038#post149272
https://www.homemadetools.net/forum/...332#post142272
https://www.homemadetools.net/forum/...447#post177602
