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Good writeup for those who dare venturing so far with repairs. A must for some old optics (especially pre-1970s large format).
I've successfully used synthetic optical adhesive from Thorlabs (here: http://www.thorlabs.de/NewGroupPage9.cf … oup_ID=196) for a Leica M3 viewfinder.
UV lamp, adhesive price (kept in the fridge, very short shelf life) and so on added to a real premium for the repair. Well worth it though.