So, I'm actually done with version 1 by now; will still use the therad and share my experience before I show the finished clock here. It can remain exciting.
I prefer to use a file for my metalwork. Personally, I feel better about the work. Maybe it's because of my education as a metalworker. As
@Megahz1 recommended, I looked at various photos on the internet of a GEN 5513 for the adjustments to the midcase. I also had a 1680 midcase from milk that I can use as a model. Here are a few pictures:
Left: milk case
Right: JKF case
As
@Megahz1 has pointed out, the luge on the JFK case are too wide. The second picture also shows that they are too high. That all has to go!
Here you can see a picture were I removed some material with the file. It lookes painful and the file and the file leaves deep marks.
After 2 hours work the shape of the case looks like this.
Left: JKF case
Right: milk case
And from the top.
Left: milk case
Right: JKF case
To get the surface smooth and polished again, I worked with different sandpapers. I started with 280, 400, 600, 1000 and 3000. From 600, the sandpaper was wetted. In the end I used the polishing machine again - but that wasn't really necessary.