... And I meant to comment that the terminology that seemed most productive at Google was "sharping levers" - which seems to be more commonly used by harp builders than "sharpening." I got many fewer useful hits with the longer term.

The pdf indicates slots that would permit moving the mechanism for adjustment. Assuming that your mechanisms are similar, I would expect the typical tiny screws and hard wood combination commonly found in other instruments, so would urge that you get a good, close-fitting screwdriver for any adjustments. Even a slightly buggered screw slot will make future maintenance a real p.i.a. as long as you own the instrument, and complete removal of such little screws for replacement, as opposed to loosening just enough for adjustment, can give you a loose hole that may not hold a new screw properly in the same hole.

John