If you plan to remove the throttle plate, grind the peened-over end off the screws with a Dremel tool before trying to remove them or you'll ruin the throttle shaft and/or break the screw before it comes out. The screws are peened to keep them from dropping into the engine in case one gets loose.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!