The mirror cell (page not in order yet)
Two of the three mirror pads are fixed and glued to the mirror board. One only is adjustable. The entire board is also on a piano hinge this gives two adjustments for each mirror cell that work at right angles to each other making adjustment easy.
I will have a good photo of this concept here soon when the cells are complete and in the mirror box. These pictures only show the mirror board and the lateral supports, with one of the adjusters. The second adjustment is made from the front of the telescope with long threaded rods and the fact that the mirror board is on a hinge as well.
The left-hand mirror cell is hinged on the left hand edge, while the right hand mirror is hinged on its top edge. This will give an independent vertical and horizontal merging adjustment.
See the adjustable mirror pad. A captive nut is screwed into the wooden mirror board then the bolt with grey knob adjusts through it. The mirror pad made from a desk draw knob has the bottom sanded down a few millimetres so that I have a small range of adjustment possible.
Pity about the chip on the front surface but I got this mirror real cheap.
The cell without the mirror, seen here with the larger central hole for the mirror retaining bolt.
Ensuring the lateral support wheel is at right angles to the side of the mirror
I needed to ensure that the front faces of the cells pads where planar with each other so they are seen here being sanded while attached to the cell.
This draw cabinet knob is siliconed onto the rear of the mirror. The long screw goes through an over size hole in the rear of the mirror board then has a large washer to stop it pulling through this hole. The bolt and washer don't contact the mirror board at all during normal use. However as the mirror is just sitting in the cell if it is lowered below the horizon or turned upside down and for transporting this bolts limits the possible movement of the mirror. If you turned the cell upside down the mirror would be hanging off this bolt and washer.