I have fitted the primary in the cell. Just 3 very substantial blobs of silicone adhesive above each of the collimation screw heads. used some spacers so ther is about a 1mm gap between the ply and the mirror to allow for air movement.
The mirror came without a centre spot so I have added that. Not a major issue but had to pay $4.95 for a whole packet of white rings, and only used 1!!
Next step is to await the bits to enable me to complete the OTA, namely, focuser, spider and secondary holder. That will enable me to work out the balance point and thus the depth of the rocker. So probably no further action until next week.
Malcolm