Hint A17 - Long axles/Locking a rod into a connector
It is sometimes necessary to create a K'NEX "rod" that is longer than the 190mm rod. For instance, to drive a large fairground model from a motor, via a long axle.
This can be achieved by "locking" two or more rods end to end, as shown in the photo.
A similar approach can be used if you want to "lock" a rod into a connector, to prevent it from turning.