How to put LEGO together upside down I'm building a truck. For the transmission, I want to make it all even and symmetrical. 

To do that I need the pieces to stay together but they have no studs connecting so they will just fall apart. 

Does anybody have any suggestions to keep them together besides using the light saber shaft? 

This is the main chassis for the truck.

This is what I want the transmission to look like, but it's quite big so I want it smaller. As you can see, the arch bricks won't go together this way so I need an idea to keep them together.
I attempt to create a searchable index of SNOT techniques, as this is called. Of those, the strongest 180 degree stud reversal are probably one of these:





If you want to connect the two curves together bottom to bottom, you should be able to do it with an axle, sort of like these two techniques:





If that doesn't work I once had luck playing around with a lever and a rubber band. It was tricky, but it did work: