Does the W140 steering box have a centering pin arrangement like a W126? If so, where is it? I see a plug between the pitman arm shaft and the frame rail but alldata.com says it's a play compensator.

On the subject of the play compensator, is this a service item? Should I check it for wear? Will I get a PS fluid shower if I remove the plug?

Thanks,
Sixto
95 S420
91 300SE
87 300SDL
83 300SD