The term 'thousand jin' of force is often used by Jinyong to symbolize the tremendous amount of power a particularly strong person might exert, or a blow from him. And yet, I think I've discovered a case where a person literally was able to exert thousands of jin of force.
In DGSD, Duan Yanqing was himself able to roll open and shut a huge stone boulder which blocked the doorway of the stone house, using it to keep Duan Yu and Mu Wanqing prisoner. It was later specifically stated in the book that the stone weighed thousands of jin. So in absolute seriousness, it seems clear and unquestionable to me that Duan Yanqing, one of the weaker 'top tier' fighters in TLBB, is literally able to exert a force of thousands of jin.
Are there any other examples of people literally exerting a thousand (or thousands) of jin of force?