Is the rod end still loose in the rod sleeve? You may have to rotate it a bit to get it to go in straight. Wiggle the wheel while you push up on the joint into the arm. Unless you have the wrong end? Compare it to the old one.

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Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport