C405 The response of the adventurers

"However, the design of the crossbow can be changed a bit. The lever can be changed to a winch, which will make it easier to store energy. crossbow arrow can also be changed from single hair into multiple hair. For ease of movement, the axle can be set below... "

After that, Zhao Fengnian made a few more suggestions, and they all lowered their heads to take notes.

"Actually