Is there a reason why all conventional domestic electrical wiring fittings use exclusively slotted screw heads, rather than the much more practical Phillips or Pozidrive heads? Don't tell me that electricians can only carry one screwdriver?
If you have a screw and nut, by all means align all the screw heads and tighten the nuts against the screws; but if you do that with wood screws, some will be too tight, and some too loose.
It depends on what you're fixing. I was always taught to align the screw slots with the grain when screwing wood into place (being slightly soft the wood could absorb the extra up to half a turn - none were too loose) - but when fixing metal (e.g. hinges) to stop as soon as the screw was fully home.
If you have a screw and nut, by all means align all the screw heads and tighten the nuts against the screws; but if you do that with wood screws, some will be too tight, and some too loose.
It depends on what you're fixing. I was always taught to align the screw slots with the grain when screwing wood into place (being slightly soft the wood could absorb the extra up to half a turn - none were too loose) - but when fixing metal (e.g. hinges) to stop as soon as the screw was fully home.
