FOTGA M42-NEX insert

[ENG] Insert for FOTGA M42-NEX adapter. When I bought this adapter and screwed my Helios -44M-4 lens to it, I noticed that the aperture closing button was not pressed. For the lens to work properly, the aperture must be able to close. Therefore, I offer you an insert for this adapter, which solves the problem. To assemble, you need to unscrew the adapter and insert the insert with the wide side to the matrix, then assemble the adapter back. An additional ring is needed if you have a short thread and the button is not pressed all the way. For printing, I recommend using black HIPS or other matte black plastic. PLA shines strongly even if you use sandpaper and paint with a black marker. Perhaps black matte enamel will be better, I have not tried it.
Filling is enough 10%, but I printed 20%.
[RUS] Вставка для переходника FOTGA M42-NEX. Когда я купил этот переходник и прикрутил к нему свой объектив Helios -44M-4, я заметил, что кнопка закрытия диафрагмы не нажата. Для правильной работы объ