I haven't gotten to try this, but I've heard that using a Dremel tool with a cutoff blade is the best way to do it. I've gotten the tool now, but I haven't cut the tine yet, so I can't advise you on how exactly to go about it. You can also cut tines with wire cutters, but it's a lot harder and doesn't give a nice flat end, which from what I understand can affect the volume of the note.
-Dan
-Dan