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Fully glued mirror cell - after keyboard fumble
The spacing is set with rubber O rings. I wanted about 2mm thick or a bit less but ended up using some only 1mm thick. There are 2mm holes in the trianges at the centre of glue points to allow the excess to escape.
The primary 27 glue points are about 15mm in diameter. The next 9 should be about 3 times larger in area eg about 25mm and the final three I made about 50mm which is the largest that would fit on my 25x50 base frame.
I think it is very important to use RTV silicone as it has the strength. Needed a week to cure.
I glued the O rings to the triangles with a little silicone a few days before the final assembly. The glue escape holes allow alignment rods (nails) to be temporarily inserted to get the triangles into alignment. I traced out the primary pattern on the mirror before I started.
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