The problem....., if it is a problem, is that even old No42's and 53's are fetching a kings ransom on the auction sites.

It's alright having one as 'spares' but your average joe with a needy No32 couldn't set one up optically even if he had the spare bits. And who else has the light transmission facilities?

I'm sure that the way to go is for someone to invest in a few No53's, get CAD drawings run up and start......................... But it's not me!