When the bath tub would not drain , I removed the trip lever with a metal linkage and a metal lift rod and a plastic plunger.
when I found the clog was in the basement trap, I put the drain assembly back. THE trip lever would not raise & lower the plunger. When I tried to remove everything, it seemed liked it was catching on something, IT is inside a PVC pipe .
I tried to lubricate the linkage with grease. did not seem to help.
Any ideas ?