Inspect all the cam lobes and rockers carefully for wear. I put a wrench on the crank and bring each lobe straight up, inspect it and the rocker, and do the adjustment. Also, the ball studs can be very difficult to move because the metal is soft and rounds easily. Best tool is a ground-down 17mm (I think) crowfoot. If you can't move it, remove the rocker and put a socket on the ball stud.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe