Function well, installation fiddly

As already written several others here is the installation with some fumbling quite well, one has a corner cut off to get the field in the key. However, you must first remove the original field from the key and went with some violence. The Tastenfald was injection-molded onto the housing at the factory and it has a kind of toothing at the edge. It is this edge is in the new field a good half mm from, visible and tangible. Perhaps it could be sticking.
The function is anyway to 100% restored.

The price is unbeatable, the merchants, the part is just to get together with a key blank for astronomical sums.