Because they were to easily pulled out of their front guides and the more times this happens the more bent they become resulting in them pulling out easier and easier. Once out when the motor is turned on they could poke a a young child's eye. I always thought that if there were a bob of plastic at the tip and the rods could only be installed with the drive wheels out and on an angle before the motor is set down then they would stay put or at least be much harder to pull out.
![[Image: 004.jpg]](https://s26.postimg.cc/cumswdmnd/004.jpg)
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