Chapter 91 Diligent Xiao Ran

Zhao Yin also walked over curiously, picked up a spring, looked at the heavy, powerful, strange metal ring in his hand, and then looked at the heavy caravan. He instantly understood the reason and a look of sudden realization appeared on his face.

So that's how it is!

Jiang Ling pointed to the spring and explained, "This is called a heavy-duty compression spring. It looks quite big; it should be able to support the frame. Try putting a few of these in the connection between the axle and the frame, and secure them with sturdy iron hoops or bolts."