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Yes, spacers will make it worse.
Try moving the primary mirror up the tube equally with all three collimation bolts.
Move it up as far as it will go then back it off enough to give it room for normal collimation adjustments.
This may be enough to give you focus if you only need 10mm or so.
gb.
Last edited by gb_astro; 13-08-2011 at 09:45 AM.
Reason: Clarification
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