GRW/TSI/M1 - Shadowband Misalignment
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The shadowband was intermittently misaligned and not completely masking the sun because the mirror became loose from the shaft while being polished. The shadowband was realigned on 1/14 but by 1/27 was again slightly misaligned. The instrument was reoriented with true north on 1/27 and the shadowband adjusted again on 1/31. The problem was corrected on 2/2 when the mirror mounting was tightened and the shadowband realigned.