Doepfer

I did it: 
I used switches with for 5 mm holes.
Without remove any knob or boards. 
Just being careful using the drill starting with 1 mm and scaling til 
the 5 mm.

the holes are done 10 mm from the right border and 12.5 mm from the 
center of the driven filter.

I added a couple of photos under a127 mods