The setup has a hub bolted to the crankshaft with a large very tight bolt. The "damper" sits on the hub and then the pulley sits over it with the six allen bolts holding both to the hub. I dont see any way that the damper would fail and end up out of round. I'm suspicious that the large bolt that holds the hub has worked loose and the whole shebang is wobbling and likely damaging the crankshaft at the same time. FWIW if you have to remove that large bolt for the hub you hold the engine at the flywheel. There is a special tool for the job but you can get by without it. Just be warned that large bolt should be tightened to 250ft/lbs + 90 degrees....=really friggen tight.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff