The original factory-installed film advance lever retaining rings are made of aluminum alloy.
Brass Film Advance Lever Retaining Ring for Leica M1 M2 M3 M4 M6 M6j TTL MP MA
New Brass Film Advance Lever Retaining Ring Shutter Guard Ring for Leica M7
Film Advance Lever Brass Retaining Ring for Leica M1 M2 M3 M4 M6 M6j TTL MP MA
Film Advance Lever Replacement Metal for leica M8 M9 M3 M4 M4-2 M4-p M6 Camera
Film Advance Lever Decorative Trim - Cap/Cover - for Olympus OM1 OM2 - 2 Pieces
3D Printed Mamiya 645 Super Pro TL Film Advance Crank Knob
