GOod point on the pulleys, Ferdman. They are all typically $12-40 online and can easily be changed in little time. Trying to get a damaged pulley back into the condition it needs to be in to be reliable is not worth your money to pay a tech to do it and still not know if it is 100%. Replace any suspected pulley since they can not be made to be "near perfect" and be reliable if you already have belt issues.

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red