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On high speed centrifuges it was lefty tighty on the internal bowl parts and righty tighty on the external module parts. Muscle memory made it easy but it was a bitch working normal things off work.



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Toilet flush levers.
 
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Circular saw blade retaining nut
 
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Knock-off hubs on my 1970 MGB; right-hand threads on the left, left-hand threads on the right...rubber mallet in the boot!


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Our Motorhome wheels have reverse threads…22.5 inch Alcoa wheels. Good idea to remind the techs when it’s time for new shoes.
 
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quote:
Originally posted by Chris42:
As far as mower blades, look at the cutting edge - if you were to hammer on the cutting edge, it would make the nut(or bolt) tighter.


On my Hustler zero-turn it is the opposite. I hit a tree root and spun the blade off. I'm guessing it is set up this way to prevent damage in such a situation.


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Some drill chucks where screws in the center hold them on.
Gas cylinder threads - usually have the corners of the nut cut to denote reverse thread.
 
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The Lounge occasionally has reverse threads, e.g. "What's the worst thing that ever happened to you?" vs. "What's the best thing that's ever happened to you?" Like threads on machinery, people sometimes turn these the wrong way.
 
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quote:
Originally posted by triggertreat:
On high speed centrifuges it was lefty tighty on the internal bowl parts and righty tighty on the external module parts. Muscle memory made it easy but it was a bitch working normal things off work.


I was going mention purifier retaining rings...kind of a specialized field.




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Every oxy/acetylene torch setup I've ever used has left handed threads on the fuel side.


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My USP Tactical has left hand threads. The Mark 23 has right hand threads. I believe this was designed to make me buy two Knights suppressors.



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String trimmer head




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Sideplate screw on NAA mini revolvers.
 
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Ejector rod on some S&W revolvers.


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Left threads, right threads. And centrist threads. I have here in my hand a "screw" with threads neither left or right. The thread cuts are rings with no left or right pitch.



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quote:
Originally posted by 6guns:
quote:
Originally posted by triggertreat:
On high speed centrifuges it was lefty tighty on the internal bowl parts and righty tighty on the external module parts. Muscle memory made it easy but it was a bitch working normal things off work.


I was going mention purifier retaining rings...kind of a specialized field.


Yes it is. Do you work in the field?



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quote:
Originally posted by George43:
Ejector rod on some S&W revolvers.


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quote:
Originally posted by BlackTalonJHP:
Circular saw blade retaining nut

Excellent. That's a good one to remember.




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quote:
Originally posted by Ranger41:
quote:
Originally posted by Chris42:
As far as mower blades, look at the cutting edge - if you were to hammer on the cutting edge, it would make the nut(or bolt) tighter.


On my Hustler zero-turn it is the opposite. I hit a tree root and spun the blade off. I'm guessing it is set up this way to prevent damage in such a situation.

That's extremely interesting. Makes sense for expensive commercial mowers like that. A lot when you think about it. Hitting a stump on a home grade mower is one thing, doing that with a commercial prob a different ball game.




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quote:
Originally posted by Hamden106:
Left threads, right threads. And centrist threads. I have here in my hand a "screw" with threads neither left or right. The thread cuts are rings with no left or right pitch.

Made in China ? India ? Hmmmm.




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