I'm no expert on harp details, but the pdf file at:

http://www.musikit.com/Merchant2/pdf/leverinfo.pdf (152 KB file)

has pretty clear pictures of a generic kind of lever, and some instructions for installing the levers. It might be assumed that adjusting them would fall withing the scope of how to get them in the right place at installation.

(Right click and "Save Target As" to download the pdf file to your own machine for study?)

John