Billybob exaggerates as usual. The HF pulley tool is $7.99 on sale, not $8 [edit] Oops, he did say 'about.'

http://www.harborfreight.com/pulley-spinning-tool-66385.html

Release tension on the belt to determine whether the fan wobbles on the clutch, the clutch wobbles on the pulley or the pulley wobbles on the water pump flange. Unlikely it's 2 or 3, more likely to be 2 and 3 since the pulley floats between the clutch and the flange. The pulley will have to come off to determine definitively if the water pump shaft is wobbling. Check for wobble, radial and axial play. Then decide what parts you need.

Sixto
87 300D