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hi Rod, as the mirror moves in it's normal focusing operations the grease which surrounds the mirror becomes uneven therefore allowing the mirror to flop from side to side, on the lx classic you hold the mirror in place by way of inserting the supplied bolt in the mirror lock hole while you remove the focuser, before you replace the focuser you move the bolt back and forth which in turn moves the mirror along it's full length of travel redistributing the grease evenly around itself and so placing even pressure on the mirror at all times, on all other models this is done with the focuser mechanism just before it is secured back into place.
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