Seafire, have you tried chucking the expander stem in a drill and polishing the expander button with 400 sand paper.
I’d get it down close to what worked, then use 600, 1,200 grit to really slick it up.
DF
Agree with Mathman's idea that the neck is probably too tight.
No matter how slick the expander is, an overly tight neck will always be a problem.
It may be a good idea to call CS and see if you can send that die back for them to check it out.
DF
