On Wed, 7 Aug 2013 23:32:31 -0700 (PDT), Deodiaus
wrote:

I took it apart and think the screw goes into the hole next to the base about an inch from the countertop and faces away from the user. I can't find the threaded hole where it goes into. There is a split ring holding the little plunger in place, but I think the screw goes somewhere around there.

Examine each part closely. There may be a blemish, discoloration, or
indent of where the screw head rested once tightened. The circle will
be obvious -- to me.

By now you have called the company or visited the web site, right?