PreferredCustomer

There's clean and then there's clean. I had a similar experience to yours and it wasn't until I polished the bottom of the primer bar with a polishing stone that things were remedied. While solvents will wipe away the primer residue grunge, keep in mind that you compress that residue into the bar with each cartridge loaded. That presented itself on my system with a pock marked appearance on the base of the bar. Once that was stoned smooth, the press operated like new.