The cause of the wobbling pulley needs to be found and cured. If the pulley is bent, it needs to be replaced. If the shaft is bent or the bearings worn and floppy in the water pump, it needs to be replaced.

The "wooooooo" noise is probably coming from the pulley wobbling back and forth and making belt noise as a result. Probably also what took out your tensioner pivot...

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]