Effectively, is not very good with my hands, I fear tjs fixtures .... At the time, I had the same problem as the person before it with spinning wheels, so, I tried to use a file and to use the rear wheel is driven ... and this useless because the problem was elsewhere: on the front wheels which forced ... So I removed the front wheels, it is also that there is an additional tip and trick is precisely to just snap the tip and does not push more than 2 mm, otherwise, this is where this is rubbing the front wheels on the tractor and the motor is degraded Now, even on our floor, the tractor drives perfectly. Moreover, our children wanted a second tractor .... is it, and that the cover opens is nice as well, he likes to repair, something that does not exist on its Another tractor. Overall very satisfied compared to the price.