The lesson to be learned here is don't try to remove throttle plates from the shaft unless there's a good reason to do so. If you do, drill the peened end of the screw away and use new screws to reinstall the throttle plates. You can loosen the screws slightly and tap on the plates to make sure they're centered in the bore, then retighten the screws but don't dismantle things all the way unless you've got new screws on hand.
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!