III equatorial head. Mark III equatorial head. This Model No longer available. III equatorial head. A Mirror cell made from 24mm exterior grade plywood , from the picture you can see three support posts which are made from 25mm diameter hardwood dowel which has been glued and screwed to the mirror cell,the support posts have about 10mm gap between the mirror side and the post which is filled with silicon sealer, also three 5mm holes on the back side of the cell is filled with silicon, when it's set after about 48 hour's this will be secure and will allow expansion of the mirror as it reaches ambient air temperature.
Collimation is done with three bolts at the back of the cell.
This picture of a diagonal mirror and holder, is also fixed with silicon and three small aluminium clips. It is fully adjustable and adjustment nut can be seen which moves the diagonal holder up and down the telescope tube,also visible is the three adjustment screws used for tilting the diagonal mirror until a perfect alignment is achieved. 9 point Cast alloy fully adjustable mirror Cell main casting is 10mm thick and very rigid. A light weight full adjustable four vein spider made from 1mm thick steel veins. Various sizes can be made to order.