Lead Eyes makes a 1/10th ounce dumbbell style eye set. I haven't found any heavier.

http://www.fishusa.com/product/Lead-Eyes-Dumbbells

The I-Balz are great eyes, but they aren't very heavy for their size as compared to the Lead Eyes.

1/10th ounce eyes with some lead wire wraps on the body of your jig could get you to the 1/8th oz overall weight.
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EZ Thread Yarn Balls

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