Here is what the button looks like installed. But I'll remove it first so it doesn't get damaged while installing it.
 

I'm at the Escape Room helping my son-in-law install the movable arm. But before we could do that we had to cut a section out of the floor to mount everything to. This room is basically square but there is a 12 foot moveable round section in the center of the room. Look close and you'll see part of the round slot on the floor.

Anyways, after cutting out a section of the floor, we needed to add a few pieces to fasten our freshly cut-out floor piece to.
 

We had to be careful on the placement of the larger pulley to make sure it cleared everything. This was easy to do because it uses a V belt which can be mounted just about anywhere.
 

Here is the arm installed and wired up. When it has power, the arm turns slowly towards the gate and will then stop. After one of the players hits the button, it will swing back to it's staring position and out of the way. One thing I found out was that the players will not exit here, which means no one will mess with or damage this arm which is good news.