You could use the feather as decoration on the other end of the chain/string, if that works for you. I'm not sure if you want both the crystal and the feather to act as weights or just the crystal, but if it's the former, maybe my idea can help.
But I just re read that last bit where you said you don't want to exactly use the feather as a weight on the back (I assume is on the other end of the string). This would be complicated because the feather would very much interfere with the pendulum's movement.
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