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I used the paper ribbon wrapped around the tube and measure the exact middle of the EP holder in relation to the focuser..remove the paper ribbon...fold it flat...mark the crease..replace ribbon on tube in exactly the same spot...measure the distance from the edge of the ribbon to the centre of the EP holder in the focuser..mark this distance from the crease with a straight edge ruler to the spot on the tube that would be exactly opposite the centre of the EP holder..remove the secondary...drill a 3mm hole in the tube..be sure to put a few layers of masking tape on the inside to catch any filings..then use masking tape to pick up any stray bits...if all went well, look down the focuser and see the hole..put in your collimation piece either cheshire cross-hair or laser and it should align with the hole..if not..adjust to suit...plug the hole with a self-tapping screw and paint it with a black texta...replace secondary and complete collimation.
Cheers!!
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