Well, if they are closing, then your well used points are not conducting anymore. Once the silver plating is gone, that is what happens. At 19000 miles you must have some kind of world record, and a very good condenser! I,d say You got all of those points. Something else you have to keep in mind while we wear our points out to the nub, is the effect on timing. Even though you can adjust them to get the proper lift, as the rubbing block wears, this may happen at a different time, depending on the geometry.