It can be done with only one set of hands. Just hold the tensioner off and pull the belt off of the pulley. Do the same thing when you put the new belt on, and save the tensioner pulley for last.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record