I'll Give You a step by step process on how to make in (in hammer). I decided to write this because of all the good feedback the chamber has gotten. anyway, lets jump in!

Step 1: Make a "point_push" using the entity tool and change the radius and magnitude to 200. Then go to flags and check "Push Players" and "Push Physics".

Step 2: To make the spinning part make 2 flat cylinders and a rod (as a cylinder) and put them together as in the map. then highlight all of them together (by holding CTRL) and hit CTRL-T. Next, turn it into a "func_rotating", and make the "Max Rotation Speed" to 200. The go to flags and hit start on (even if you want it off first)

Step 3: Some other details are the orange lights in between the spinner, the sparks under the grating, and possibly antlines (The blue and orange dots)

Step 4: Now, I wont go through ALL the activations and deactivations it reqiures, just under outputs make it so that they turn off and on depending if your on the button or not.

Good Job! You (hopefully) made a working repulser, if you have any other questions on how to make it, just comment below, and i'll try to answer them. New maps coming soon! Bye!