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Thanks for the info Roger yes you are correct i have found it is a Sampson Mount. The secondary is as you describe a lot of obstruction, I compared it to the new 12" dob. The focuser is destined for the recycle bin it is totally non-operational. I will invest in a Crayford style (10:1 fine focusing).
I do not have the Richard Berry book but i have the "How to make a Telescope" by Texereau which although published in 1957 still has some good ideas for ATM`s. I will check for the Berry Book.
Now when you come to Aluminising I am a little confused, the mirror needs recoating (aluminising) then the overcoating is a protective layer?
So from your description these are 2 different steps and from Marks input (thanks Mark) it seems that Astro Optical are not the preffered supplier.
Appreciate the helpful comments and suggestions
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