Everyone, thank you for your help.
Mal, I tried several different refills. Some would just fit, the Schmidt (my go to refill) wouldn't work at all.
Danny, the refill did not move smoothly. I reversed the spring and still no luck.
Earl, I reversed the spring and still no luck.
Tony, the nib tip was fine.
I ended up taking all of your suggestions, plus a call to Ed at Exotic Blanks, with respect to the coupler that the nib screwed onto. At Ed's suggestion, I took a chain saw file and gently twisted from the inside of the blank. A couple of tries and the refill went in and out smoothly and the pen now works! I really appreciate everyone taking the time to share their suggestions. It's members like all of you that make IAP a great forum. Thank you all again.
I'm attaching a photo of the completed pen that now works!! The blank is called Red Velvet.