polarized glass polarizer on the main divide speed optical holder. Ensure the location of the white dots on the glass coincides with planned LM1-A on the main divide.
Polarizer polarizer inserted into the optical division ring holder. Ensure position coincides with the white dot on the glass bar on division ring LM1-A level.
Coronal polarizer polarized lens mounted on optical, holding scale. Make sure the position points match the line on the glass white LM1 sub ring scale.