My hunting bud modified his and I modified a CDS dial also. I also put a zero stop on my mark 4.
Do you know how he modified it? I popped mine off and there is a weird metal plate spring over top of the clutch mechanism. I'm guessing if I popped it out the ZS would be disabled, but I chickened out.
BTW I am the one who sent the email to Swaro - they told me to get a flatter-shooting rifle. I don't think they quite understood what I was looking to do