I have been given some odd telescope parts by a neighbour
He knew I couldn't resist
So the question for the experts is how do I successfully turn an 83mm OD doublet down to an 81mm doublet without breaking it.
I do have a glass grinder (diamond grinder with water wheel) and may have access to a glass linisher)
My first thoughts are to make 4 self adhesive coloured vinyl circles 81mm diameter and attach them to the elements,
then mark the orientation onto the sticker so that after grinding I can get them back the way they ought to be,
the vinyl will be the grinding guide and will also protect the optical surfaces which are not coated.
Your thoughts??????
If this works I will have binocular pair of 3" F15 brass scopes which would look quite good on the Gaunt mount.