Modular design, modular assembly, if there are any areas that are not smooth, lubricating oil can be used, such asD70In addition to paraffin wax, diameter is also required3mmRound wooden strips and rubber bands










































Modular design, modular assembly, if there are any areas that are not smooth, lubricating oil can be used, such asD70In addition to paraffin wax, diameter is also required3mmRound wooden strips and rubber bands










































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