Yes, this is on the spring mount. It is not a wheel hub. I thought an o-ring might work because there is no high-speed rotation. It only rocks back and forth a short distance, and at low speed compared to a wheel hub. An o-ring should at least be better than the felt washer that was originally used in this application. (But apparently the felt washer wasn't good enough because it was replaced by the lip seal.)
The speedy-sleeves I've seen won't work on such a narrow surface. It seems logical that there should be a style that will work, so I should look for a more comprehensive catalogue.
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