I'm never an early adopter, so this helps me narrow things down a bit.

It was best to narrow things as much as possible.

The long, narrow thing on the floor proved to be alive.

"Well, does it narrow things down for you in terms of suspects?"

"By focusing in on one problem from the start, you narrow things down too quickly."

It was too narrow, for one thing - narrower than any face Jessie had ever seen in her life.

I admit it's a short cut, but it might help narrow things down a bit.

It was a very narrow thing for the professor's life.

"It was a narrower thing than I care to think about."

Look what it's taken just to narrow things down to this number!