Help an idiot fix a carb

I feel like the biggest dumb as*! I am in the process of rebuilding a thermoquad i bought several years ago at a swap meet. The boss where the idle speed screw was not drilled for a screw from the factory, so i drilled and tapped the hole for the screw. My idiot self drilled the hole crooked so now the screw misses the arm that its supposed to touch to hold the throttle plates open! If it were regular metal i would just have the hole welded back up and re-drill and tap it again, hopefully straight, but im sure this pot metal or whatever it is cant be welded. Any ideas of a fix?

aluminum solder like at the fair wear they stick pop cans together

where do i get the aluminum solder and what do i use to melt it?

Put a small nut on the end of the screw?

Try again be moving it down and over

https://www.harborfreight.com/8-piece-low-temperature-aluminum-welding-rods-44810.html

wow! Just watched the video..never seen this before. Im assuming you have used them? If so, will this fill up the hole dense enough to when i go to drill the new hole it wont just fall back out of the old hole?

I have never used the rods. I suggest lots of practice before actual repair. These rods have been around a long time under different names and sellers.

I first saw this commercial on Sunday afternoon TV around 1999. This company named it Alumaloy: https://www.youtube.com/watch?v=TZ5sD9hQTyw

I thougt about JB welding the hole the re-drilling and tapping a new hole, but figured that because the JB is so much softer than the carb aluminum, that the drill would just walk back over into the JB and follow the old hole..Surely these aluminum sticks would be arder than JB..?

I never tried it yet but good test video https://www.youtube.com/watch?v=fKIKsDfRAcs

Back when I was in the Navy one of my duty stations was at an antenna overhaul shop. We had occasion to fix hole in the aluminum casting when corrosion ate them out. We used Devcon aluminum putty. A two part aluminum based epoxy, essentially. Once it set up we just redrilled and rehelicoiled the holes. It ought to work fine for you, not real cheap for just that one tiny hole you have though.

The above should work, if the offset screw isn't making contact, a nut on the end would increase the surface area.
You could even file/grind the nut to achieve the shape needed.

Epoxy it up and re drill and tap it.

And, if the nut were to rub against the body of the carb, drill the hole on the right hand side of the boss. You can get another screw, put it in the original hole and cut it to fit flush so you have something to fill the hole and maintain strength in the boss.

On the new screw on the right hand hole you can use the nut. If the nut is too far away you can fit an over-sized piece of metal and tap it to fit the screw.

Something like this:

^^^^^^^ the above is a good repair in my opinion.
not hard to do, and parts required are super easy for most anyone to acquire.

Thanks! I should have been a Mechanical Engineer.