1964 Plymouth Valiant Convertible-Latch Problem

ConValiant64 said
On the driver's side of my 1964 Valiant convertible, the latch doesn't fully lock the top to the window frame. Not sure what might be blocking the mechanism, but is there an easy explanation or fix?

Are you saying the top doesn't seat down on the windshield frame, or that you can't get the latch to lock?