Hi, I am getting ready, for the 1st time, to do a button filler overhaul, on a 1920's Parker Duofold Red Hard Rubber Fountain Pen. I have never done a button filler of any kind in the past and would appreciate any and all comments to help me with this repair. I am not ignorant to pen repairs as I have done 5 snorkels recently, as well as some Parker Vac's and the mundan lever filler's. Thanks for any help,
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