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You are correct, it is a lightweight delux. The axis shafts are 1" steel rods
(not the original heavy 1.5" ones). I just realised that the scopes illustrated in the
catalogue are 8" f 7's, hence the different tube configuration. There are guide
scope mounting holes on the tube, so I think the original owner had that option
as well, hence the larger counterweight. There is not any noticeable play in the
drive system. For guiding I use a 12V dc to 240v ac drive corector and have
never noticed any periodic errors.
I have resprayed the mount and replaced the mirrors with a set made by
Coulter optical in the US. I will at some stage get the original mirrors recoated.
The originals are made with much thicker blanks. I had to put a weight in the
bottom of the tube to balance it. That is one drawback of rotation rings they are
fixed to the tube. I have also made a mount for 4" f7 achromatic guide scope.
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