Sounds like the same mechanism....and that is exactly what happened, the adjuster ratcheted out about 1/8" (probably 1 groove). Thinking that we had to remove the spring pressure, we removed the outer retainer cover with a large allen head and removed the spring, but discovered that the tensioner would still not move back.

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Andy_M
'98 W140 S320 Black/Black
'06 W164 ML500 AMG White/Grey
'03 Porsche 986 Midnight Blue/Grey