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>ok thanks.
> AFAIK, delrin is ok.. We had an embarrassing incident with a bearing
> that
> was nylon vs delrin, because the engineer in charge insisted on using the
> materials with the lowest possible coefficient of friction. The
> prototype
> worked fine in wisconsin in the winter, but failed miserably at a demo.
> The
> bearing locked up so tight you couldn't turn it with pliers.
> Did I mention that the demo was in Cancun?