I've found that a lot of times the wrench doesn't fit correctly and that helps strip the head of the screw whereas other designs aren't as easily striped, such as star, square and even slotted. Most of us don't keep an assortment of screws to replace the old ones; although it's not a bad idea; and I would venture even less own a torque wrench for small screws such as that. After using several different types I don't think the Hex (or Allen) head screws are a very good design, especially for small screws that need to be kept tight.