My version of mirror lock on C11

1. A lot of silicone resin was added between the primary mirror and the mirror cell to provide more support to the mirror, as the original red silicon resin used by Celestron was too little. Care was taken that the silicon was applied only on the thickest part of mirror, especially at the focus arm. The serial no. of the optics was 6368, and it was made on 18 March 2000. The line joining the serial no. and the focus arm was the alignment line, it has to be aligned with the serial no. on the corrector plate.

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2. Holes were drilled on the mirror cell and then they were tapped with M3 screw thread. The silicon prevented the drill bit from accidentially going too deep and directly hit the mirror.

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3. The yellow plastic tube helped to set the appropriate depth of hole and thread.

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4. A three arm plate was made from 1/8" thick 6061 aluminium stock. It was secured on the mirror cell with M3 screws.

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5. Another load of silicon was added to the gap between the mirror, mirror cell, and the aluminum plate, so that the mirror was support by a much larger area, and firmly secured to the aluminum plate. The position of the aluminum plate will be locked with 3 screw rods.

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5. 3 screw rods has been added by the prior owner, as his version of mirror lock. They are reusable in my version of mirror lock.

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6. The tip of the screws, as used by previous owner,  has a soft-padded floatation head, to directly support the mirror without deforming the figure of mirror. However, the mirror was quite heavy, so it would be difficult to lock the mirror firm enough to prevent mirror movement and at same time not to introduce deformation of mirror. I will remove the padded head and let the screw rods support the aluminum plate directly.