As I always tell my wife, instructions are for sissies! LOL. Without instructions the seasoned woodworkers and cabinet makers appear to be magical and mysterious! :-)
And seriously then every screw would need to be labeled with which way to turn it for insertion or removal and I doubt that there would be enough room for that and the cancer warning label. :-)
Actually, not a mirror image. If it were a mirror image both sides would work the same. As it is both are identical, but you turn one upside down to mount it properly. Which one is upside down is anybody's guess. :-)
It would sure help if left-handed ones were marked somehow. ;-)
I came close to replacing a lawn edger after I spent a week trying to (un)loosen the bolt that held the blade. Then there are the cars where half the lug nuts go the wrong way (at least the threads are visible).
A good rule of thumb is to simply look at the normal direction that the object spins. Almost always you loosen the attachment nut or bolt in the same direction. For the nut or bolt to loosen by itself during operation it has to spin faster than the object that it is holding which is much less likely than if it loosened in the opposite direction.
Chrysler/Dodge/Plymouth used to do that. The lug nuts loosened on the left side of the vehicle in the customary direction, counter clockwise. The right side loosened, clockwise. Countless lug nuts were twisted off in shops on those vehicles until they stopped that practice.
A nut or bolt is less likely to loosen and come off the farther it is located away from the center of rotation of what it is holding.
Leon wrote in news: snipped-for-privacy@giganews.com:
*snip**snip*
If you move the screw in the tighten direction, sometimes it loosens enough for you to remove it. Covers both breaking a frozen screw loose and a left-handed screw.
Swingman wrote in news:Q-2dnWlV_cab9yPLnZ2dnUU7- snipped-for-privacy@giganews.com:
No, you kind of missed my point. The design is bad if the lever can move both ways, but only one has an effect. If the lever can only move one way, it's obvious when you're pushing the wrong way because it doesn't move. It's still symmetric, up on one side and down on the other, but it's user-friendly about it.
A guy in maintenance was having a difficult time drilling out a pop rivet. He asked his boss to sharpen the bit. No better he told him "you can't sharpen a bit for crap". Joe pushed a button on the drill and said "now try it"
And you mine. It is a practical truism that, with most designs/engineering endeavors, convenience generally comes with a price.
This is a case where it is arguably better to take the time to learn how something works, than to have additional, unnecessary cost and complexity crammed into a single purpose device.
Basically the convenience of "non-handed" trumps a small inconvenience for those of us who must occasionally spend some time on the left side of the bell curve. :)
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