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?

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)