Fountain pen nib stress testing machine

Fountain pen nib stress testing machine.

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Previously:

https://www.homemadetools.net/forum/...518#post122888
https://www.homemadetools.net/forum/...836#post102618
https://www.homemadetools.net/forum/...709#post133111
https://www.homemadetools.net/forum/...363#post126977

Fountain pen nib stress testing machine - GIF