My solution for keeping the ferrets on their side of the room divider is as follows:
The old eye screw - I put these in the side of the room divider. Into the wall I put these:
This prevents the herculean strength ferrets from sliding the room divider and making their escape. So far only one jail break - we made a slight adjustment and its been quiet since. Fingers crossed this does the trick. Love those little weasels - wanting them to have more space to play.