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Mike,
Be careful not to over tighten things with OTA's. Using multi-grips is over kill, and can cause distortion in the tube because of the excessive pressure on the spider. This may in turn affect the position of the focuser, leaving it not square. If you've used multi-grips, you have over tightened the spider! This will also put undue pressure on the small screws that hold the vanes to the spider hub, and can distort the vanes too. Firm finger/hand pressure is all that you need to hold the spider securely in place.
Alex.
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