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This is a GSO/Bintel scope with the springs is that right?
They can be a little jerky I noticed when I used one. The teflon is probably not the issue, more likely to be dirt on the other bearing surface.
I also found the they had a little knob that the upper end of the spring attached too and that could be a little worn and would make the movement jerky, maybe try lubricating that, I think from memory I tried a little candle wax and that helped a bit.
Malcolm
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