The new interface for DDD brand is either BANANA or M3.
If you choose M3 over BANANA, The unit comes with M3 brass screws sticking up. This is actually a good interface for touch or using conductive foam or using alligator clips, but you can choose to add STUDS, which mostly take the M3 format screw.
Procure these items on the internet. Such as eBay or Alibaba. They're called "leather working studs" and come in a variety of shapes. Spikes are the evil ones; don't get them. Try 10mm but really any spikes are evil because they're going to be resting on firm wood not giving leather, so if you fall on it, you die. I like the 5mm buttons. They hold an alligator clip really well.
Once they come in the mail (check the shipping times), finger tighten all your STUDS on. If some have threading issues you should have a steel M3 screw on hand that you could work in and out to clear up the threads. Once you get them all on and you like how it looks, take them off and one by one put a drop of thread-locker on the M3 screw and finger tighten it again. Now it is semi-permanent.
Don't get the spikes unless you are really know what you're doing, and you don't have any kids that can fall on them or pets. I will not be held responsible for what you do with your STUDS. Also consider getting conductive foam to play it with. Make a wand like I did in STUBERBRO 1, 2, and 3.