Deo,

The out of focus pictures don't help. If you send a photo of your faucet
to Pegasus, they will tell you what model you have. From there you should be
able to find a drawing (hopefully an "exploded parts drawing).
Is the hole that you like threaded? If so what's the problem with trying
the screw in that hole? A stubby or a 90 degree driver should work.

Dave M.