August 25, 2025
Description
For the set you need one or two 4mm steel balls (use one or two) and PVC hose OD/ID: 18mm/14mm (14x2) or 16mm/12mm (12x2) and of course two rubber bands as a “springs”.
Have a fun,
stah
License:
Creative Commons — Attribution — Noncommercial
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stah
