Usually, i have found that those carbs don't need somebody fiddling with the adjustment screws! I have worked on a bunch and if the thing didn't run right, it was for some other reason.
But, grind down something to use on those screws, paint it bright orange, drill a hole thru the handle, and tie a large shipping tag to it, and hang it on the wall, so you can find it later!

They do need adjusting just like any other carb does. The EPA just doesn't want ordinary people adjusting them. To answer your question I have not seen a special tool yet but I bet one is made. On mine I used a small hemostat to turn it but even with that it was hard to do. Most likely you will have to fabricate a tool but a ground down screwdriver isn't the answer.

I know this is not the the proper way to do it but on ones that I give away I take a drummel tool with the thin blade and cut small grooves in the screws then adjust with a jewelers screwdriver...it works

I agree the are adjusted too lean and depending on model number some won't run without stalling. Check ebay there are hundred of them on there with only couple of hours on them that were returned cause it costs to much for any type of repair so they auction them off. I got one with a busted pull rope spring for $7 bucks it didn't even get started, got a red 4 stroke for 15 bucks. the plastic tang holder alowed the tang on the spring to slip past and uncoil the recoil spring. After figuring out what happen I driled a hole and staked the spring tang was the 25CC model. I also done the same thing zoomie did removed the carb. adjustment screws with needle nose pliers and slotted them so I could adjust them with a screwdriver. It ran prefect after I richen the mixture up just alittle bit. sold it at a garage sale for $40 bucks with orginal box and manuals. told the guy up front what I had to do to it.

You can find the splined one's on ebay, kind of pricey though usually around 8 bucks plus shipping, I seen a D shaped one which are even more pricey 15 bucks or so plus shipping, but they are more rare. That's the ones I had to remove with needle nose pliers and cut the slot in so I could adjust them.

Well I found the screw drivers on ebay for 32.00 dollars for a set of four plus 3.00 for shipping. Might just get them if any one else needs them the guy says he has a lot of them I will give you his name if you like to add to your collection of tools.

That's too high I got one for 8 bucks. keep looking.