Stuck mixing idle jet

So i bought a used pair of carburetors but the mixing idle is stuck and previous owner tried to drill them out but in the wrong angle what could i do to get it out?

I thought about melting grease on top and use a stroke screwdriver?

You're going to have to file it flush, use a larger bit and center the hole.
Steve

One option is to cut a new slot with a dremel cut-off disc. Use a torch on the carb body around the screw and lots of PB Blaster (or similar) before attempting to turn the screw. Turn in both direction in an attempt to get it cracked loose. Once you do just keep rocking the screw both ways with heat and lots of pent. spray.