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I have a 102 and have had it for 7 years. It has done numerous automated imaging runs I the last 3 years and does not exhibit that sort of wear or damage. It got loose about 6 months ago but still was focusing until it got so loose that it slipped totally. Even then it did not get that worn.
In my focusor there is not Teflon, so I don't know where that comes from.
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