Calculating force?

You'll need to put together some more info to obtain an answer, besides a pretty picture.

Who's the wench, Miley Cyrus?

 

Well, for a start, identify what the lines in the picture mean, along with a description of what you are trying to do. Once that is done, then you need to specify what materials you want to use for the various parts and their sizes, etc. You know what it is you want to do. You have to describe it to others in order for them to understand.

 

Is it at all possible that you meant "wrench" rather than "wench"?

 

No, it's an all-too-common mistake to confuse 'wench' [a female servant] with 'winch' [a mechanical device for hoisting].