Yes I tried not including FAT and NARROW and it didn't work.
But I just tried writing
my.flags |= POLYGON;
instead of
my.eflags |= POLYGON;

That's my action now:
Code:

---

action Drehkreuz()
{
	wait(1);
	my.flags |= POLYGON;
	c_setminmax(me);
} 

---

When using FAT or NARROW It must be "eflags" but when using POLYGON it must be "flags". Now it works without having to split the model

@vlau

Quote:

---

if you don't see a
bounding box (blue color) surrounding your model
then you're done correctly.

---

Actually I see a blue box surrounding my model, but it works.