He's correct about this. Phillips was an early attempt at a one-way fastener. Doesn't mean the manufacturer isn't a dick for using them. If you're working on s

He's correct about this. Phillips was an early attempt at a one-way fastener. Doesn't mean the manufacturer isn't a dick for using them. If you're working on something really important, like auto mechanics or the like, consider buying new fasteners when you reach re-assembly. Those old stretched bolts probably need to be freshened up anyway.