Does anyone know where I could find a replacement nib for this pen? It doesn't even have to be the proper nib for the pen as long as it will work. I really like this Challenger, but I'm afraid the nib was victim to my foray into nib smoothing

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I'd appreciate any advice on nibs that might work. Also, if you have a nib that would do, I'd be more than happy to offer a fair price for it.
Thanks,
Ryan
