On some acutators you can simply replace the rubbers, other actuators the rubbers aparently cannot be replaced. On my 108, I can replace the rubbers and as such suggested to a friend that he could do the same on his 1985 123. NOT. He had to replace the entire actuator.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.