Forge - Pinball map help

Hi! I was making a Pinball machine map on Ravine and plan to film it and put on Youtube whenever they put up the file share system on Waypoint. Everything was coming along nicely until designing the “flippers”. On Halo Reach, you could place tripmines, with the phased ability, on top of blocks and shoot them to serve as flippers. But now, they’ve gotten rid of the phased option on the tripmines, so that’s been thrown out the window in Halo 4. Any ideas?

I also have screenshot in my file share labeled “Forge help” if you need a pic.