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I did this mod, replacing the teflon bearings with the shielded bearings, and what a difference it made, but, one small issue that others should be aware of, the shielded bearings are a slightly smaller diameter than the teflon ones, so when you have screwed in the tension handles they take up the difference in height and are actually supporting the weight of the scope rather than the bearings. You can actually see a small gap between the scope and bearings, so you may have to remove the plastic sleeves on the base that the handles slide through which makes the holes slightly wider so the scope can sit on the bearings.
Peter.
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