"...Some BB cartridges use a plastic cup, where grease can attack the plastic, on those you do not use grease, you just tighten it down until the plastic breaks, and replace the cup with a metal one
..."
--too funny!--
I also had the click. LBS fixed the old BB for $20. Because of this experience, despite moving, I still drive 30 miles to them every time, because I know they will do go work for a fair price.