I am new to Gopigo and am just starting to build one with my son. While we were assembling it, my son noticed that those two motors have magnets in the front. So when we were close to finish, he said, oh, so the front caster turns because of the pull from the magnet in the motor! First, i was suspected but then it got me thinking: how the front caster turn? What’s the mechanism behind it? What he said makes sense,but is it really the case?