I've just picked up a 1936 IIIa due to a sudden attack of G.A.S - it's in pretty good nick considering it's 71 years old, just the usual brassing and the odd ding and so on. The most noticeable defect is that the collars from the two circular rangefinder windows are missing - the lh one has a threaded collar with ring wrench slots, and the rh has a smooth collar with similar slots.
Does anyone know of a (preferably) UK source of replacements? Fleabay hasn't turned up anything, so I'm scratching my head about this...

Does anyone know of a (preferably) UK source of replacements? Fleabay hasn't turned up anything, so I'm scratching my head about this...