Ken Gross from the USA build our GBC 29 Heavy Duty Pump – 42063 C Model. Did you notice that the big wheels spinning have no functional meaning but are only for aesthetics?!
Inspired? Get the building instructions and start engineering today: https://pv-productions.com/product/gbc-29-heavy-duty-pump-42063-building-instructions/
See also our GBC C Model Building Instructions & other products: https://pv-productions.com/product-category/lego/