Coat the teeth with Prussian Blue, spin the pump for a while, and the tight spot should show up as a shiny area where the bluing has rubbed off. If it's a noticeable area, dress the high point down with a diamond dust needle file. A tiny high spot should wear in pretty quickly.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!