Thingiverse

Hand exerciser

by NOP21

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exerciser ressorts spring toys

exerciseur à main
https://www.youtube.com/watch?v=fZVx_Pv31P8&feature=youtu.be
coller les axes dans les 1/2 balles
choisir une matière dure pour augmenter la résistance des ressorts.

hand exerciser
stick the pins in 1/2 balls
choose a hard material to increase the resistance of the springs.

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Thingiverse

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