Brass Screws, what can you do...
Well these screw heads are not the typical Phillips head, which introduces the tapered slot, you are probably using a Phillips head, and the contact points are not great.
I normally find that switching to a small flat screwdriver works better in this case. you could maybe try that.
Essentially, getting screws out requires a few things.
Good contact on screw head.
- Try to find a better fitting driver, or try a flat head.
- Make sure that your angle of the driver is spot on
- Try to apply constant torque
- Press as hard as you can on the head.
Non seized thread
- first spray some penetrating oil
- Tap on the heads with a small hammer
- You could even heat up the head with a blow torch.
All of these factors are good cases for a power screwdriver, you can press hard, they have good torque and help you to align the head to bit. If you do have one, you can even put it in its lowest torque setting and get the drill to do that clicking that it does when the thread it too tight, that may loosen the hold on the screw head.
IF you dont have an electric screwdriver, then try to get a set of grip clams (vice grips) and clamp the shaft of the screwdriver near to the end of the shaft, it will allow you to hold with two hands whilst applying good pressure and torque.
Obviously the other thing you can use is WD-40 penetrating oil, which will loosen the screws slightly. The other thing is to heat up the head with a small blow torch, which, being brass, will heat up nice and quick, once cooled, you could try again. You could also tap slightly on the heads with a hammer to loosen.
I mention the oil and heat last, since i don't think you have a seized thread at all, a little bit of elbow grease should do the trick. Remember, brass is easy to sheer off. so you dont want to snap them off.