Attached to the front cover of the assembly, there is a split boss with a tightening screw.
When the vision tubes are assembled into the casting there is a brow rest that fits into this split boss and the screw is there to lock, said rest, in place.
The last items of note are the two curved plates on the inside of the front cover, these act as springs and they hold the vision tubes in place when they are assembled into the casting.
That's all folks.
Jon
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1950 Land Rover series 1
1967 Land Rover series 2A LWB
1986 Land Rover series 3 SWB
1938 DKW SB200
1944 DKW NZ350-1
1967 Ural K750 sidecar outfit
1944 VW Kubelwagen KDF82
1942 Steyr 1500A
1944 Morris C8A
1943 Chevrolet CMP8A HUP?
194? Bedford QL
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