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Barry
Firstly, the correct spelling is "collimation".
Next, what is the error and how big?
Usually with a laser, you first check that the beam is hitting the centre spot on the primary. If the Cheshire is done correctly, it should be very close. Tweak the secondary to centre it. Then check the return beam against the target on the collimator and tweak the primary to centre.
Unless the error is huge, I wouldn't worry to much.
Malcolm
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