Thanks knothead! I was looking through McMaster Carr's stuff.. Delrin is a slippery plastic. I'm wondering if I could get or make a washer like thing for between the surfaces. I think that's what the new CDI uses
I'm almost sure that there isn't enough space to insert any material between the surfaces. But I suppose you could give it a shot.
Believe me, if you smooth out the roughness and coat it with the dry lube, it will make a world of difference.
Then it's important to rinse the unit out as well as you can after using it in the future to keep it clean and salt free.