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I then adjust the primary until the return beam goes back thru the hole in the collimator target. so far so good, now I take my home-made collimation cap (film canister) and look thru the focusor with it and the Primary center mark is off center by about 4-5mm vertically, if I adjust the primary so the mark appears dead center thru the collimation cap then the laser beam misses the target hole.
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CS-John B, fwiw, I used these figures... Maybe mis-interpreted his meaning.
L.
ps. My Meade DOB has it 'factory built in' to the 2ndary holder. ~4 mm...
pps. Damn hard over the net...