The joint section is weak against shocks, so be careful not to input excessive power, The joint section is weak against shocks, so be careful not to input excessive power, The joint section is weak against shocks, so be careful not to input excessive power, The joint section is weak against shocks, so be careful not to input excessive power, The joint section is weak against shocks, so be careful not to input excessive power, The joint section is weak against shocks, so be careful not to input excessive power