Please be more specific regarding:
"trying to remove the metal sleeve in between the plastic piece and thread"
Are you talking about the top of the shock where it attaches to the body?
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)