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1) The laser had quite a bit of wobble in the focuser, and after wobbling rotating the laser in the focuser I was able to ensure that the laser dot was as close to center rotating around the pri. mirror ring circle.
I am assuming you have a Rack and Pinion focuser. I could never get really good collimation with my 150 newt because of the slop in mine, even after shimming the inside of the focuser body.
Just fitted a Crayford and the difference is wonderful, no movement of the laser spot on the primary from full in to full out on the draw tube.
Bill
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