Our experience in using K'NEX in different settings has led us to the conclusion that the K'NEX Rod 190mm Grey should be used sparingly in model design, for three reasons:
1. Few sets include these rods in any quantity.
2. They are relatively expensive to buy as individual parts.
3. When used in larger structures, they tend to bend slightly, reducing the rigidity of the structure.
A cheaper alternative is to use two Rod 86mm Yellow joined by a single Connector 2-way straight Orange, as shown in the photo above.
An even better approach is to replace each grey rod with two Rod 86mm Yellow and a Connector 5-way Yellow.
The 5-way connectors can then be interconnected to give greater strength - see photo opposite for a simple example.