62max has a good idea, but I actually had this problem myself about 2 yrs. ago & used Scott's drill method & a propane torch I believe and was able to get the outboard idle screw out. It may have helped that I'd only broken off half the head of the screw.
My 2-cents.... try the drill method & if that fails, go with 62max's idea. What do you have to lose?
Hey 62max....HOW DID YOU MAKE THAT NEW INSERT.... I (we) are all ears.
70 Roadrunner convt. street car
440+6, NOS, 4-spd, SS springs
'96 Mustang GT convt. street car
'04 4.6 SOHC, NOS, auto, lowered
"Officer, that button is for short on-ramps"
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