Sheaffer clip problem

I just bought a used Sheaffer in stainless steel and its
a good writer with a nice fine nib but the problem is
the clip is stretched out and I want to know if anyone
has any tricks to correct this.
I can't remove it, the cap end does not un-screw.

Otherwise, its a nice pen and its made in the USA.
Does anyone know if the latest Sheaffers are still made
in the US?

Thanks,
Pete