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Thought I should join in this thread about shimming the cheap focuser drawtube with the adhesive teflon tape, as I have done it to my 150mm f8 Saxon newt. It had a horribly wobbly focuser which spoilt an otherwise very good scope and though the drawtube is a little bit tight now the image doesn't move halfway across a low power field when changing focusing direction.
I think I may have given Mental the tape he has as I used it a lot in my area of employment a few years ago and always had scraps left over that would otherwise been thrown out.
As Mental also said, if you want some tape, it is quite expensive to buy, send me a P.M. and we can work out a deal. Just the cost of postage that is.
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