Which of the two below is a correct English phrase please (Oh, no, not “neither”, huh?):
(a) I would not dare to unscrew…
(b) I would dare not to unscrew…
(“Dare” specificity is meant here).
Neither of these sentences does much to demonstrate whether dare can be a modal verb. Dare can behave like a modal verb sometimes- when we say I daren't tell them, it is. It is sometimes classified as a semi-modal, like need, which means that it can behave like a modal or like an ordinary verb.
In neither of those sentences does DARE function as a modal verb.