That works on some. Although, a lot of the flat head screws end up without enough stump to get a pliars onto. But that's about the only way (without an ezout) to get a caphead or buttonhead screw out of something that's recessed like your wing mount. For flathead screws, it's either ezout or dremel. Typically, they are on a part that is accessible to a dremel, so that's what I do as I've yet to buy an ezout. I just ignore the damage it causes on the part around it.Here's an alternative method I use from time to time on stripped screws...
For M3 screws that take a 2.0mm hex driver you'll need a 7/64" drill bit, drill and needle nose pliers or vise grips. For M4 screws use an 11/64" bit. The following example is a stripped M3 screw that holds one of the wing mounts.
Carefully drill the center of the screw head
View attachment 21080
Check depth until the head of the screw pops off and starts rotating
View attachment 21081 View attachment 21082
Remove part to get it out of the way
View attachment 21083
Use needle nose pliers, vise grips or a pair of side cutters or dikes to unthread the remainder of the screw
View attachment 21084
Took me longer to make this post than it did to successfully drill and remove the stripped screw.
Hope this helps others as an alternative method down the road when dealing with a stripped screw