Yep. Too small a space for the carving blade too, so have to take small cuts off with the tip, then work them down with a pointed round file (normal file won't fit), finishing with a thin fibre-glass pencil and sandpaper... after that they need filling where the pin marks cut into the ribs, and to clean up my own cutting work.
You know, the usual.
Second nearly done.
View attachment 755605