On Mon, 03 Nov 2014 12:56:05 -0500, wrote:

If this never worked, look at the
strike and be sure there is a camming action when it closes.
(The ramp on the strike, hits the sloped part of the bolt)

A "nugget" I learned was to put red lipstick on the end of the latch
bolt...close on the strike. Red marks possible binding. Adjust and
keep your powder dry.