You can adjust the preload to alter the ride height. But it's akin to slapping a bandaid on a bubbling chest wound. The wrong way to go about doing things.
Shave the seat, get the lowering link and drop the forks through the triples. Altering preload alters the way the bike reacts when it gets bounced/bumped, and it will also greatly affect the way the bike handles.
I'm not a fan of half measures, or slap-it-togetherness.