I did this on an Elk but can be done on any antlered animal. This can be done many ways but this worked for me so I am going to share. The skull plate was split for shipping to the shop from Wyoming. First I drilled a pilot hole into the antler from underneath the skull plate. Be sure to mark your bits so you don't go all the way through and out the other side. Then I drilled a 1" hole using a paddle bit. Again, mark your bit with tape.