Unfortunately, only to use without filter

The camera LX7 has a filter thread with which you can attach filters to the lens.
But this lid does not allow.
For this you need the slightly wider cover ALC LX7BK no longer even costs.
The part is stuck, if you have screwed it right.
For this purpose it is necessary to remove the lens has a front ring and then unscrew the part in the same direction of rotation accordingly.
These are a type of bayonet lock without screw.
Because I will not sell the part, you can contact for a Aufschraubanleitung to the seller when needed.