Guess I was reading that wrong.. thinking the threads were stripped....
You might have to take out the radiator to do it...
But the very best way to deal with bad phillips head screws is a hand held impact ... hit it with a hammer... this is what saves motorcycle mechanics.... LOL
But it takes some room to have it in place and get a little swing at it...
Ps, be sure you have it adjusted so it goes the correct direction.. or it will surely take the screw head clean off or take out all the threads from the inside of the hole....