This is a tool that helps to remove the retaining ring which holds the main taking lens in Czechoslovak Flexaret TLR cameras. The ring is deep inside the camera and it's hard to reach to it by common tools and spanners, so it requires custom tool to get loosened and taken out. It also helps when inserting and tightening the ring.

It is recommended to print from PETG for better durability, possibly with wider extruder. The two teeth (pins) are small, but hold rather well, when the tool is properly inserted and pressed against. If they break, you may either print another one, or you may cut to the handle and insert small metal parts into the plastic.

This tool is suitable for Flexaret model VI and VII. In older cameras, the retaining ring has narrower notches. You may use the print as a handle, cut the pins loose and insert some metal piece instead such as old screwdriver tips or similar.

Notes:

1. don't forget to loose the small hidden screw that holds the retaining ring in place
2. use lot of perimeter print and bottom/top layers to make the pins strong
3. don't attempt to repair the camera if you don't know ho to do it properly or you will most likely damage it instead