I have a quite nice looking Sheaffer pen with about half a white dot left in it's clip where the original white dot is broken.

Is this a part that might be available anywhere and, if it is, how easy is it to get the old one out and replace it with another one. Do they just slot in or glue in somehow? Has anyone ever had to replace one?

I was wondering if the only way to get a replacement white dot is to buy a broken pen for parts, but then remembered I might have once seen white dots for sale on ebay. Perhaps I dreamed it.

If anyone has a spare white dot please let me know.