So I've glued with epoxy the new three position lateral switches to the C64's bottom side of the case making two holes for them. These are for the SidFX instead of the military original ones:
I'll try them tomorrow. I'm moving the switches while the glue dries just to be sure that they kept in the right position as there isn't more room in the holes than the necessary.
Edit: Oh yes, they work perfect. Now I've just ordered a switchless dual kernal switcher.
And also I've just received this PSU. I haven't finished my black one yet, but I'll do tomorrow I think:
Edit: Nope, they didn't work so well -the modyfied switches- so I'm going to try filing the case internally to have a thinner depth and using the original switches as they are.
Edit: Yep, I did that. I filed the inside of the case where the switches go and they are working perfect now.