# data[].attributes.headline
pin两端加挡块，防止绳子滑脱

# data[].attributes.subject
pin两端加挡块，防止绳子滑脱

# data[].attributes.headline
fixing the pin in the hole by end stopper on each level 

# data[].attributes.subject
fixing the pin in the hole by end stopper on each level 

# data[].attributes.body
change the position by one person

# data[].attributes.headline
ensure the arm move in channel smooth no any stuck by define WI

# data[].attributes.subject
ensure the arm move in channel smooth no any stuck by define WI

# data[].attributes.headline
fix the pin on each level to end stopper

# data[].attributes.subject
fix the pin on each level to end stopper

# data[].attributes.body
Cut other position

# data[].attributes.body
Weld the catapult

# data[].attributes.body
keep the pin deepth same