I have a 100N with a stiff piston. I want to open it up to lubricate the piston. It looks to be a postwar model with a later section, synthetic seals, but also 1937ish 14k nib. I’ve been soaking this thing for a week, and it doesn’t seem to want to budge. I’ve been under the impression that all 100N nib units are threaded. Is that correct?
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