Hi Greg,
That sure is an interesting telescope.
I always wanted to know more about oil spaced lens designs.
I tried to find out more about it on the internet but details are few.
For instance - are all the triplet lenses oil spaced?
Some people oil just two lenses as in this link:
http://users.belgacom.net/astronomy/other.html
- but of course that is just a home made effort & not from a master like Yuri.
Who would be qualified to collimate this telescope if it ever needed to be done?
Maybe oil spaced refractors never go out of collimation?
cheers
Allan