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    Re: Lunar distance measurement in ideal conditions: attainable accuracy.
    From: Bill Morris
    Date: 2013 Jan 18, 22:19 -0800

    Alex,

    You could test your worn-teeth-near-zero hypothesis by taking, say 6 degrees on the arc as your zero and adjusting the mirrors accordingly. While there may not be three degrees of adjustment at the mirror adjustment screw, there is usually enough clearance in the holes that attach the index and horizon mirrors for you to loosen one or the other (both if necessary)to make a coarse adjustment before tightening the screws and then using the mirror screws. As there are about six threads of the worm in engagement with the rack, 6 degrees should get you well away from any worn area near zero.

    I've just tried it with a Freiberger. There's about 7 degrees of play available at the horizon mirror. Q.E.D. (That means "quite easily done" doesn't it? ;-) )

    Bill Morris
    Pukenui
    New zealand
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