Repolished the TWINAMP long tube windows

We removed t he winodws from TWINAMP lone tube, and found they were very dirty. The small black grains on the surface like last time. There was a thin gray film on the inside surface when we looked the windows at the grazing angle. This film could not be removed by normal optical cleaning method. So we tried to repolish it using 1 micro power. After repolishing, the surface looked very smooth.