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Thanks for all the suggestions guys, much appreciated.
I'm pretty sure I can rule out the focuser and drawtube. I had the
locking screw done up, so no slop in that department, and a heavy
hand on the focuser didn't exacerbate the issue.
I've already replaced the springs and knobs with Bob's from Bintel, but
there could still be something going on down there I suspect.
There is definitely tube flex, when I have the scope vertical and give it
a gentle hug the spot moves.
Next step is closer inspection of the springs and how far they are
compressed (or not).
Cheers,
Jason.
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