I did not see this mentioned anywhere in the Sheaffer forums and wanted to share and get more experienced views.
While working on a vac-fill the black nut used to attach the blind cap was quite tight with shellac and time so I applied heat and gripped it with a pair of small pliers. That was a mistake as the nut was softened by the heat and was immediately pressed out of shape. I was surprised that it would melt at all and now I know.
Nonetheless the heat did loosen the nut and I was able to remove it. However, it no longer held the blind cap and slipped through the collar. I had no replacement and thought I could salvage the nut with some epoxy.
The result was a somewhat imperfect nut for the blind cap attachment fittings. It fits quite well and took a bit of time to file and check the fit along the way. I'm hoping the epoxy will hold and there was enough material to stick to so perhaps it will.
Anyone have any experience recreating this nut?