We solved it by applying the leveling compound a bit into the door frame, and the bathroom threshold was mounted on top of the leveling compound. However, a piece of wood is needed under the threshold and outside the leveling compound, but it should be easier to obtain than custom ordering a threshold. However, in our case, it wasn't perfect as the leveling compound wasn't completely even at the door, but we should have resolved this by sanding it down evenly before we installed the threshold.
I did just like marsman80. I applied leveling compound under the threshold. Then I cut a piece from another threshold and glued it underneath. The seam is only visible if you bend down, so I didn't even bother trying to hide it.
I just needed to raise the hinges a bit. Pretty tight, but it doesn't touch and can be raised a bit more. However, I thought before that I would have to cut the door.
Need to find oak mouldings to create a height of about 36 mm.
Will put it on a regular threshold so it becomes about 45mm+.
Can shop anywhere in Stockholm.
How do you think it should actually look? Should it be like a threshold plate about 36mm thick?
Or should it be a straight threshold without a "notch"?
I might be able to make one for you, but I would like to have a drawing then.
Isn't it just a matter of going to your nearest furniture maker? I recently bought a threshold from the nearest furniture maker for me. He made it based on the drawing I gave him. 1500 kr but it fit like a glove.