Annoyingly, I can't get inside the '76 Gran Fury I just pulled out of the junkyard. All 4 doors are stuck as the latch mechanisms are bound up, presumably from sitting untouched the last 25 years. My typical modus operandi would be destructive, but the body is clean enough, I don"t want to hurt the doors. Any chance there's a trick to freeing stuck latches with a careful application of slim-jim, coat hanger or penetrant? Am I resigned to breaking glass (at the least?) Anyone overcome such an obstacle, please share your tips! 2nd straight 74+ with 4 stuck doors! What are the odds!