In reply to sgiand:
I managed to get the old style petzl quark pinky rests on my DMM fly's. It did require drilling out a small 5mm hole in the spike to get the bolt through.
My advice is to get a tungsten/carbide drill bit (at least I think it was) and a pillar drill (as it's most stable) and got for it. I did and I thoroughly enjoy climbing with my fly's in this way.