My $0.02, it does say in the MB shop manual not to disassemble the newer tensioners.

Yeah, I know these assemblies cost $70 new on the 'net but I'd look at it as a $3,930 dollar savings.

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86 560SL
With homebrew first gear start!
85 380SL
Daily Driver Project

http://juliepalooza.8m.com/sl/mercedes.htm