Ok not sure what the big deal with the little Allen key is. You get one with the scope and one with the Custom dial when you order it. I have had one in my wallet on a piece of card stock for going on 4 years now. I also have spares in my range kit and travel kit. To be honest I have 3 rifles with CDS on them. They have been to Africa and back, one rifle has made 2 trips. Along with range trips once a week for close to 3 years and I have yet had to rezero any of them.