My belief is the original door ferrules were mounted at the factory in the same way hollow rivets are mounted. The commonly available tool around today works by curling parts of the ferrule against the inside of the door to hold the ferrule in place. It's adjustable for depth. It works much the same way an old "church key" can opener would curl the section of can lid into the can. IMHO it doesn't work very well because the ferrule isn't mounted as firmly as factory. If you have or can make something to spread the whole interior part of the ferrule like they did at the factory you'll have a much better result.
Last edited by Tiny; 12/18/2012 9:02 AM.
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