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That would ruin my day. But aren't the throttle plate screws swedged just like the air horn throttle plates to make it impossible for those screws to back out? When I took my throttle body apart for powder coating the screws looked like they were screwed in through the rod then cut off and the tips of them looked like they had been melted. So if you back them out you will rip the thread out. And the screws were flush with the back of the rod so I could not just grind the swedged tip off and unscrew them without ruining the thread. That's why I had to tap them the next size up 8-32. I would think all the throttle plat screws would be the same. Unless of course some one had messed with them previously.