Key tumbler/column problem

[blazer72]

yeah, so, I was stranded at work yesterday. I had noticed that my ignition tumbler was slowing going south. It required frequent wiggling, cussing, and holding my tongue just right. Well, I switched out the tumbler and it's better, but still not right, what's the problem. Every once in the while, I turned it and hear a "ting" sound. It's a little chunky sometimes, and sometimes I have to turn it back and forth a couple times to make it work.

Any suggestions appreciated. It's an '86 with standard, non-tilt column.