Put a large alen key in the top and a smaller alen key in the bottom and twist. That will get the reg apart. If the coller won't come off try taking the elbow that holds the microcline off.
Anyone know the size of the allen keys? I have bought 3 sets and haven't gotten the right sizes with them. I would love to just buy them as singles, lol.
If you have access to a vice, preferably rubber, put the reg in it and use a large 5"/16 allen key to get it separated. The allen key needs to be at the bottom of the reg to twist it apart.