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If the spring is not wrapped it may be the spring. the portion of the spring where the springs are wound closer together are most likely hitting each other on big bumps.
You can get the wrap for them or if you want cheap fix wrap with electrical tap around those few coils. It will create a buffer so it will not be the metal coils hitting each other. this should reduce/eliminate the sound. it is cheap and quick fix but most likely not long term.
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