I think you mean spanner.
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Beat m3 to it. Dang computers pick what it thinks you are saying. Doesnāt know what a spanner is yet.
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Open endā¦ lol
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Yes, I did mean spanner, may have been autocorrect and I missed it.
Even back then, almost all factory nuts had some type of locking mechanism. It may not be obvious anymore. Some had a deformed punch area in one of the nut faces, others may have used a dry Loctite patch applied across the threads.
Use the new nylock nuts and donāt over think it.
One final thought- never use an open end wrench to apply either tightening or loosening force. They are not meant to do that. Even the best made wrenches will spread apart of too much torque is applied. Thatās what the closed end is for. All these should need is a hex key to hold the shaft and closed end wrench to tighten the nut until snugā¦
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Even a quality line wrench will spread rounding off a flare nutā¦
But yeah, always use the boxed end if at all possibleā¦ the open end is mostly used for speed wrenching on vehiclesā¦
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Or where the design team decided to make it impossible to get a sock or box end wrench on a bolt or nut. As I recall, the retaining bolt for the blower motor resister was like that, and only room to turn a few degrees at a time.
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Only thing worse is when you have to keep flipping the wrench each time too. Iām getting too old to put up with that nonsense 
I bought a set of Gearwrench ratcheting crow foot (feet?) that are pretty nice under those circumstances.
I bought some of those open ended wrenches with the asymmetrical jaws and another set with the notch. Both allow rotation without removing the wrench. Way faster than a standard open endā¦
When I had my diesel I bought a set of those crow feet sockets. Pretty much mandatory for changing filters or injector pumps. Once every few years though they come in handy for something.
My biggest aggravation lately is knowing I have a particular tool but being unable to find itā¦sometimes they magically appear a few weeks later just to taunt meā¦ 
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Not only different diameters, there are also different thread pitches for every diameter bolt.
Mostly 10mm sockets and wrenches. I canāt find one, go buy another. now I have several of each.
Heh heh. Yeah soldering irons, cement trowels, etc. I have two of everything. Often the original is in plain sight. After five years though Iām still looking for my awl that I used on my mower and disappeared in my single back garage stall. No problem though, I bought a replacement.
The nice thing though is harbor freight and their cheap tools. Sometimes itās just easier to go to the car and use the spare wrench or metric or sae socket in my trunk.
Story: I was changing springs on my garage door and the ratchet with the special socket for square nuts fell on the floor. The socket flew off. I finished up with a crescent wrench and the bought another socket and painted it brown to be distinct from all the others. About six months later the wife was cleaning out the trash can where we store the flags and other pole items, and she said is this what you were looking for? So it had bounced on the floor off my step ladder, flew about ten feet and into the trash can. Who figured? So now I have two painted brown. I have new springs waiting for a nice day to change them again.
Donāt feel bad. My text to my dentist was about being x-rayed, and the phone changed it to being āprayedā. Much confusion ensued
I cleaned out from under one of my tool boxes and found my snap on coolant pressure tester, had been missing it for yearsā¦
still donāt know why I put it there, but I had put some other stuff under there on purposeā¦
There are open end torque wrenches. Very expensive. Maybe the parts store would loan or rent one to you.